Loading presentation...

Present Remotely

Send the link below via email or IM


Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.


Forensics: Criminal Profiling

Green River Killer(Gary Ridgway)

Gavin Zeng

on 10 October 2012

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Forensics: Criminal Profiling

Green River Killer(Gary Leon Ridgway) Unit 4: Criminal Profiling Utilization of Criminal Profiling Was Douglas's and Keppel's profile correct? Reliability of the Profile Offender Characteristics of the Green River Killer Bock 1-4 Jordan Lai and Gavin Zeng Creators of the profile: John Douglas, a FBI agent, and criminal profiling pioneer, and Bob Keppel, a law enforcement officer, and detective Premise of the profile: During the early period of the case, John Douglas was appointed to profile the Green River Killer. Douglas based much of his conclusions on early photographs, the first five alleged prostitutes that were murdered, and the bureau's general understanding of serial killers. -based on the way the bodies were dumped in desolate roads, and illegal dump sites, and covered with foliage and garbage wrap, Douglas inferred that the killer may have considered them as "human garbage," which is the reason for him to dump the bodies in such a manner. -From the location of the dumping sites of the first several bodies, Douglas surmised that the killer lived or worked relatively close to that area due to the killers knowledge of where to place the bodies -Due to the killers active and sudden murders, Douglas concluded that the Green River Killer was most likely to be a confident man who also had compulsive tendencies. He also deduced that it was likely that the killer would revisit the crime scenes in order to re-enact them. -Shoe prints found on a victim's skeletal remains revealed that the killer was a size 10 or 11. This is indicative of the conclusion that the Green River Killer is a large and physically able man. - Based on the locations of the bodies, and the access the killer had in soliciting these victims, it was concluded that he drove very frequently. In fact, he drove in a van or four door car. - Douglas also reasoned that the killer's activities in seeking out prostitution for a means of a sex life meant that he was divorced. - As a result of the condition of the crime scene, and the litter found at the crime scene, Douglas concluded that the killer was most likely an inattentive or messy person. - The habit of the killer to murder prostitutes may have a religious justification because the killer may want to rid the world of the stigma of prostitution in a religious context. - Based on the remote locations of the bodies, it can be said that the killer is an outdoors man - The nature, placement, and similarities of the first several victims were all carried out by the same person. Robert Keppel's Revised Version of the Green River Killer's profile In contrast to Douglas, Keppel based much of his conclusions of the Green River Killer's profile based from the assistance of Ted Bundy, who was also a serial killer whom which displayed similar traits as the Green River Killer. Additionally, he revised the task force and revisited all the subsequent evidence provided in the case. Keppel's profile of the Green River Killer: "The killer is most likely an outdoorsman, fisherman, and hunter": Carol Ann Christensen's body was discovered in a wooded area of Maple Valley. When unveiled, the victim was found with a fish on her neck and breast. The killer's knowledge of the placement of bodies in remote areas illustrate the killer's expertise in the outdoors. "All 49 murders were carried out by the same hand" : The occurrence of nine missing prostitutes in the span of spring to summer in 1983 reveals the similarities in the crimes committed by the same person. "The victim feels that he has been deceived, betrayed, and burned by woman far too many times and that those women will prostitute themselves." This may explain the killer's unjustified peculiar and degrading acts of bagging the victim's head and placing macabre items around them. "Experienced marital dissension growing up." May explain why the killer is murdering all these prostitutes senselessly in order to suffice his hatred for woman. A comprehensive look at Douglas's and Keppel's profile - Killer is divorced - All murders were done by the same person - low self-esteem, therefore must seek out prostitutes in order to satisfy his sex life - Frequent driver, so his car is in terrible condition - Had a past with marital struggles - Raised by a single parent - Not a diligent or neat man - Victim possibly lives near the area of the dump and murder sites -Frustrated person who likes to exert his power over his victims - Most likely religious and has religious morals - Between his mid 20s to early 30s(his physicality pertaining to his age is demonstrated by his forceful interactions with his victims) -high school drop out - Most of the murders are not preconceived(does not conspire to murder or position the bodies in anyway, usually done at random). How the Profile Was Implemented In the Case - The profile assisted the police in narrowing its search around the dump sites by creating a search triangle as it was suggested by Douglas that the victim may live or work near the dump sites(Green River, Interstate 90, and Raper's Road formed the search triangle) "May contact police and solicit prostitutes disguised as a police officer." Ted Bundy provided this observation to the police and Keppel. -Killer may be interested in police work and may have initiated contact with prostitutes disguised as one -Large man with a good physicality - Helped police narrow the suspects to potentially larger men due to the shoe size found at a crime scene - The indication that the killer may be interested in police work assisted investigators in narrowing its suspects to potential men who contacted the police in order to give tips. - The police narrowed their search to pickup trucks with a distinctive primer patch -Frequented his victims performing necrophilia "The killer revisits his victims to perform necrophilia on them." This statement suggest why he would partially bury body the victim's bodies in order to access them easier. Ted Bundy also gave this observation to the police. - The killer's interest in prostitutes hinted to the police that the killer frequented the Strip. Some parts of their profile was correct but much of it was dubious and wrong. Correct Observations: - The killer most likely knows the area of the dump sites very well "The killer knew the sites of the location of the dead bodies." : Statement was corroborated by his wife when she told police that Ridegway did in fact know the sites. "Perpetrator is most likely divorced." : Ridgway divorced twice and married three times. His behavior most significantly changed during his second divorce in which the murders occurred subsequently. "Had a past of marital struggle." : His mother was the dominant one in the relationship. His father was very passive, and that resulted in him having more affection towards his mother to the extent of even having lustful feelings towards her. "The killer possibly lives or works near the dump sites." : He worked at the Kenworth Truck Company as a truck taper/painter which was only several minutes from the Green River. "Frustrated person who likes to exert his anger towards prostitutes." : After his second divorce, this statement was clearly corroborated when his anger boiled over and he took it out on prostitutes by killing them. "Most likely a religious man." : He was a devoted religious man after giving birth to his first son in 1975. He was also seen carrying a bible at work. "In his late 20s or early 30s" : Ridgway was 33 when he began the murders. "Killer is interested and fantasizes about police work and may even contact police." : Ridgway wanted to be a police man as a child, and also on one occasion he contacted the police with information about one of his victims. He also owned a police car and ambulance. "Revisted the dump sites to perform necrophilia on the prostitutes." : This was confirmed in an interview with Ridgway when he stated that he left the bodies half buried in order to access them more easily. Incorrect Observations "Drives a lot, so his vehicle is in terrible condition." : Gas consumption and gas bills reveal that he drives very frequently, but his vehicles were well maintained. "Not a diligent or neat man." : He was actually a very meticulous man. His occupation proved this because painting trucks was a scrupulous job which required precision. "High school drop out." : He completed high school at age 20. "Murdering and positioning of bodies are not preconceived." : Highly inaccurate because Carol Christensen's body was discovered with macabre-like living things on her like fish and freshly ground meat. Another two victims had stone apparatus's inserted inside their bodies. This illustrated that he wanted to display the bodies in some fashion - The extent of the murders must have been carried out by two people - Drinks beer and smokes "Large and strong man." Ridgeway was quite the opposite as he was 5"10 and 155 lbs. "Smoker and drinker." : From the accounts of his girlfriend, he never smoked and only drank occasionally. "Two people were involved" : As far as what Ridgeway told investigators, this statement is false. "The killer is a hunter, outdoorsman, and fisherman." : The statement was confirmed as a neighbor of his used to always talk about hunting when he conversed with Ridgway. - Outdoorsman, hunter, and fisherman Controversial Statements "A man with low self-esteem." Co-workers said he was socially awkward and uninterested in woman when they walked in the workplace, others say otherwise. "All 49 murders were carried out by the same person." This statement cannot be falsified or confirmed because body clusters are not indicative of anything. Did the profile assist police in finding Ridgway? : No, in fact the profile of the killer deceived police in hunting for other suspects rather than Ridgway. Even worse, the profile also took suspicion off of Ridgway as the police frequently interviewed him early on in the case and found no connection between the murders and Ridgway. It was only with circumstantial and physical evidence that narrowed the suspect list in favour of the police in charging Ridgway with the first several murders; the profile did not help them in anyway. Due to Douglas's observation that the killer is an impulsive and reckless man, the police actually concentrated their main suspect on a taxi driver, which in turn took much of the heat off of Ridgway. Ridgway's casual and unnerving attitude towards the insights of the police also assisted Ridgway in avoiding suspicion. Organized or Disorganized? Ridgway displayed both organized and disorganized traits, which was why it was so difficult to capture him. Organized Characteristics: Mobility with a car in good condition: Ridgway was a frequent driver and took good care of his vehicles. He utilized different vehicles for much of his transportation in the murders. In one year, he would drive nine different cars in order to change his M.O (One of the many vehicles Ridgway drove) Sexually competent: He was married three times and enjoyed the pleasure of having sex, especially outside in secreted areas. The void he felt when he was divorced shows his obsession with sex as he was seeking out prostitutes. Good Hygiene: Friends and co-workers state that he was a very meticulous and neat man. Contacts police to play games with them: On one occassion he contacted a police tip line and give information about one of the prostitutes. He also fantasizes about police interactions and he enjoys the aspect of being a policeman. Responds to Direct Interviews: He was interviewd by investigators on several occassions and seemed very normal and unnverving. Ridgeway also passed a polygraph test with ease. Controlled mood during the crime: Ridgway was a very unnerving and assured man. Soliciting prostitutes to get into his vehicle required a tranqil mood. All the murders were carried out by strangulation which required close contact and affection to the victim for him to get that close to them. Kills at one site, disposes elsewhere: Many of his victims were dumped somewhere else. For example, he had three main dumping grounds which was the interstate 90, Green River, and Raper's Road. He also went as far as Oregon on some rare occassions in order to change his M.O to throw the police off. Socially competent(controversial): His friends, neighbors, and family thought he was a very friendly and gentle man; no one suspected anything of him. Disorganized Characteristics Below average intelligence: He had to repeat a grade twice, and graduated high school at the age of 20. As a junior in high school, he was reported with an IQ of 80. He received an average of D's attending Tyee High School Socially inadequate: From accounts of co-workers, Ridgway had a very uncanny personality about him. He didn't converse much about women, and he often didn't talk much at work. As illustrated by the following quotation, workers felt that he was a reticent and awkward man: "He wasn't a person you would invite to have a beer with you." Living with partner: At the time of the murders, Ridgeway was living with his son and wife. Father Stable: As a child, his father and mother showed affection towards him. However, his mother was the dominant one in the relationship and on one occassion she broke a plate over his father's head. (Tyee High School located in the town of SeaTac) Lives/Works near crime scene: He worked at the Kenworth Truck Company which was only several minutes from the Green River where he disposed and carried out many of his murders. Significant Behavior Change: After his first wife gave birth to his son, Ridgway felt angry and would even sometimes strangle her wife when having sexual activities with her. In addition, when he found out his second wife was having an affair and divorced him, his murderous intentions began. Nocturnal Habits: Ridgway's solicitation of prostitutes occured at night and many of them were killed at night. Minimal use of alcohol: He was not a smoker and only drank seldomly Leaves Body Intact: All the victims' bodies recovered were found intact. Ridgway revisted the bodies in order to perform sexual intercourse with them, as a result dismemberment would not be conducive towards these activities. Leaves physical evidence: There were 4000 pieces of evidence collected over the span of less than two decades of the murders. Leaves a chaotic crime scene: Many of the victims' were found dead with sheets of paper, bags, foliage, and other apparatus's found around them. Typology of the Green River Killer: Mission Orientated: Early on in his childhod, he had conflicting feelings towards his mother. As the dominant woman in the relationship, she had control over his father. On several occassions, when Ridgway wet his bed, his mother would come to his aid to clean the bed. This provided Ridgway the lust and fantasies he had towards his mother. At the same time, he was angry at her dominant aggression towards his father. His hatred towards women began when he contracted gonorrhea from a prostitute while he was commissioned as a navy officer in the Philippines. He also called his wife derogatory names like prostitute, and insisted that they should prostitute on the street. When both his marriages ended in divorce, Ridgway had a profound disliking for prostitutes and felt that he needed to rid them of society by killing them. However, his lust for sex conflicted with his religious beliefs. Motivation: Power Re-Assurance: As a child, the humliation his mother inflicted on him caused him to develop a hatred towards woman. Due to the offender going through two divorces, he felt a significant void in his life in which he longed to fill. In order to restore his confidence or self-worth, and to re-enact his childhood fantasies he had towards his mother, the victim engaged in sex and murder. Green River Killer: Case Summary Gary Ridgway, a man synonymously coined with the name the Green River Killer went on a killing rampage in a less than twenty year period in north Washington. Most of the murders occurred between the years of 1982-1984. Being one of the most notoriously prolific and elusive serial killers in American history, he claimed the lives of forty-nine confirmed deaths of alleged prostitutes. He had killed so many victims that he even lost count of how many lives he had claimed. A majority of his victims were found scattered around the Green River area with the exception of a few bodies found in Portland, Oregon. The victims were usually posed nude with items scattered around their bodies such as gum, paper, cigarettes, and other apparatuses in order to deceive the police. He even went as far as delivering body remains across Oregon. Gary Ridgway's sentencing All his victims were alleged prostitutes which were located around the Seattle strip around SeaTac(Seattle-Tacoma). Ridgway solicited them by showing a picture of his son so that he could be trusted. After having sexual contact with his victims in his truck, his home, or a desolate area, he would then strangle them from behind with his bare hands or with ligatures. After he murdered the victims, Ridgway would then dump their bodies in secluded areas such as the Green River. Some victims were half buried so that he could return to them in order to perform necrophilia on them. Ridgway's first victim was Wendy Lee Coffield, a sixteen-year-old runaway. A task force consisting of the King County Sheriff's office was established in order to catch the Green River Killer. Robert Keppel, a detective and law enforcement officer, who was one of the men responsible for creating the criminal profile of Ridgway was also included in the task force. Keppel went as far as interviewing Ted Bundy to obtain information on the mind of a serial killer. Another monumental player in the investigation was John Douglas, a criminal profiler famous for his work in the Ted Bundy case. By the late spring of 1983, the Green River Killer had already conducted nearly forty murders. The case became so convoluted with the ample amount of evidence, Keppel had to spend three weeks revisiting and going over the information on the case. On several occasions, Ridgway was interviewed on prostitution charges which ended to no avail for the police. He finally became a suspect in 1983 but was not emphatically pursued because his behavior did not fit the M.O. Also, the criminal profile Douglas and Deppel compiled did not fit Ridgway. In 1984, three weeks after Ridgway had murdered another victim, he agreed to take a polygraph test in which he passed. In subsequent years, he was intervied and then in 1987, the police obtained hair and saliva samples from him. The saliva sample would aid police in charging Ridgway with the murder of four victims. Semen deposited on four victims were subjected to DNA analysis that matched Ridgway's saliva sample. On November 30, 2001, he was arrested at his workplace, the Kenwoth Truck Factory on the suspicion of four murders. Proceeding his arrest, a forensic scientist also observed the spray paint that was found on three other victims and found a chemical match to the one Ridgway uses for his work as a spray painter. In return of Ridgway's plead bargain of locating the 48 victims he was spared the death penalty and charged with 48 counts of first degree murder, and sentenced to 48 consecutive life sentences with no possibility of parole on December 18, 2003 (Ridgway's heartless emotions are shown during a court hearing. His face reveals a stone and inconsiderate man) Works Cited Blanco, Juan. "Gary Leon Ridgway." Murderpedia. N.p. N.d. Web. Oct 7. 2012. Sable, Kari. "Green River Killer Psychological Profile." Karisable. N.p. N.d. Web. Oct Opfer, Chris. "Criminal Profile: Gary Ridgway." Investigation Discovery. N.p. N.d. 7. 2012. Web. Oct 7. 2012. Gary Ridgway "Green River Killer" [Video]. Dec 3. 2007. Retrieved Oct 8. 2012, from <youtube.com/watch?v=6WGTXNlr0ks>. (The search triangle implemented by the police. Notice the proximity of where the perpetrator lives)
Full transcript