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Life Cycle of the Blowfly

Danielle Van Dam

Bugs determining TOD

Step 3

-One method used to determine time of death are what type of insects are on or in the decomposing body and other uses of life stages and life cycles of certain insects to establish how long a body has been dead.

-She was a 7 yr old girl from Sabre Springs California who disappeared from her bedroom during the night of Feb. 1-2, 2002.

-Her body was found by searchers on Feb. 27th in a remote area.

-Police suspected a neighbor, David Allen Westerfield who was arrested tried and convicted of kidnapping and first degree murder.

-Masses of third stage maggots may produce heat which can raise the temperature around them more than 10 degrees.

-After more feeding the third stage maggots move away from the body and metamorphize into adults.

Step 2

-First stage maggots then feed and molt into second stage maggots which feed for 7 hrs and molt into third stage maggots.

Danielle Van Dam Cont.

Step 1

-An entomologist said insects had access to Danielle Van Dam's body between Feb.14-21.

-He also said that smaller populations of flies this year, due to the drought, wouldn't effect how long it took insects to get to Danielle's body.

-Someone for defense objected that the body wasn't dumped until after David was already under surveillance.

-But there was strong evidence present such as the girl's hair and carpet fibers from her home found in Westerfield's home. Also one of her fingerprints was recovered from a cabinet in his home.

Danielle Van Dam Cont.

-Adult female blowflies arrive within minutes to lay their eggs on a dead body.

-Each deposits about 250 eggs in the natural openings of the body.

-The eggs hatch into first stage maggots within 24 hours.

-Based on the evidence shown we believe that David Westerfield should be convicted for first degree murder and kidnapping of Danielle Van Dam.

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