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Transcript

NAA

What is Neutron Activation Analysis?

What Can It Be Used For?

What Are The Drawbacks of this Technique?

Background + History Before the Crime

-Man responsible for building the UHAUL empire has 12 sons

-one son, the eldest, Sam Schoen, marries Eva Berg

The Crime

-On April 6, 1990, in Tellerude, Colorado, Eva Berg Schoen is found by her young daughter, shot and killed by a single gunshot wound. Dogs and family are present at home, but no one hears the shot. Many initially believe that her husband Sam has killed her over a dispute about the UHAUL heirs.

The Initial Investigation

-The bullet recovered from her skull is uniquely shaped, which leads police to believe that they can easily solve the case. However, no leads are found and Sam appears to be a truly grieving and innocent husband. The case runs cold.

The Aftermath

-three years later, Tellerude police receive a call from a man in Arizona claiming that he believes his brother, Frank Marquis, was the perpetrator of the crime, and that his brother had admitted it once. His attempt to get him to say it in a phone conversation however failed, and police are skeptical.

Renewed Investigation

-police recover the gun used to kill Eva, and figure that an arrest is inevitable. Unfortunately, the suspect has done too good of a job covering his tracks, and there's no real proof besides hearsay. The barrel of the gun has even been tampered with so that there's no way to match the bullets it can fire with the one used to kill Eva.

-However, tracing Marquis's movements showed that he had been in Telluride during that weekend for a festival, and that he had a police record for rape. The detectives felt that they had their man, but catching him proved to be another thing altogether. After pressuring Marquis' travel companion, police learned that at some point on the way back home, Marquis had tossed two bundles out the window of the car. Police suspected that this was the clothing Marquis had worn to commit the crime. However, Telluride was a good four hundred miles away from where Marquis arrived home.

-Detectives searched the roadway until they narrowed the possibilities down to four places. Fortunately, a construction crew had recently moved a pile of dirt, which had buried a bundle of clothing that the dirt had preserved. On the shirt was a single strand of hair, which examiners checked in the lab against a sample taken from Eva Schoen. Forensic expert Joseph Snyder analyzed the colour and structure of the hair, and declared them a close match.

The Verdict

-When detectives told Marquis of their findings, he confessed to the crime. It was a bungled burglary, he said, which showed his knowledge of the plea-bargaining system. The officers in charge of the case believed that he had actually planned to rape Eva Schoen and had killed her in the process for whatever reasons he might have had, although police knew that this would be nearly impossible to prove. Marquis received a sentence of twenty-four years for manslaughter after his trial.

the case of eva schoen

FRANK MARQUIS

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