Purr-fect Match
Snowball helps solve Shirley Duguay's murder
Tiny hairs discovered on a murdered woman's jacket point investigators to a suspect in this landmark case for forensic science.
Original air date: February 12, 2002
Posted: September 26, 2021
By: Robert S.
Season 7, Episode 7
Prince Edward Island is the smallest of the 13 provinces in Canada. When police located an abandoned car with no plates, it didn’t take them long to establish that it had been the scene of a violent crime. Small blood droplets covering a large portion of the car’s interior initially had investigators wondering if the victim had survived the attack. But first things first – who’d the blood belong to?
A quick look at the car’s information showed that it belonged to a 32 year-old mother of five children, Shirley Duguay. When the police got in touch with Shirley’s father Melvin, they learned that she hadn’t been heard from for the past four days, but no one had reported her missing. Apparently, it wasn’t uncommon from Shirley to take off for days at a time and not tell anyone. The police suspected this wasn’t one of those occasions.
When the DNA from the blood in the car was tested, the genetic markers indicated it had indeed come from Shirley. But there were additional small amounts of blood in the car that was not Shirley’s. Over the next few weeks, investigators searched hundreds of square miles and found additional evidence, but they didn’t locate Shirley. Her father strongly believed that her estranged boyfriend, Doug Beamish, was responsible. But would the evidence corroborate this theory? And would prosecutors be able to prove Shirley’s murder without her body?
The Facts
Case Type: Crime
Crime
- Murder
Date & Location
- October 3, 1994
- Prince Edward Island, Canada
Victim
- Shirley Duguay (Age: 32)
Perpetrator
- Doug Beamish
Weapon
- None found or used in this episode
Watch Forensic Files: Season 7, Episode 7
Purr-fect Match
The Evidence
Forensic Evidence
- Blood: Spatter
- DNA: Perpetrator's
- DNA: Victim's
- Hair
- Pet hair
- Property: Perpetrator's
Forensic Tools/Techniques
- None used in this episode
Usual Suspects
No Evil Geniuses Here ?
- None occurred in this episode
Cringeworthy Crime Jargon ?
- None uttered in this episode
File This Under... ?
- Keep it in the family
The Experts
Forensic Experts
- None featured in this episode
Quotable Quotes
- "Each individual has a unique way of walking. This ultimately is transmitted to the sole of the feet, which again is transmitted to the inner sole of the shoe, and again to the outside of the shoe, as to where they’re walking to the wear on that individual’s shoe." - Keith Bettles, DPM: Forensic Podiatrist
- "The constable said to me on the phone, ‘Dr. O’Brien, I’ve looked all over the country, in fact all over the world for an expert in cat DNA technology, because I would like very much to know whether or not the hairs that were in the lining of the jacket, which are tied to the scene of the crime, (Because the jacket was covered with the victim’s blood) are those hairs from Snowball?’" - Stephen O’Brien, PhD: Geneticist, National Cancer Institute
- "It took approximately half an hour from chasing the cat from under the beds to every room of the house until… It was almost like the cat knew that we were taking him in." - Constable Roger Savoie: Homicide Investigator
- "Roger Savoie told me he went down to the house and read out the rights… the cat’s rights to the parents. And I said to Roger, ‘What’d the cat say?’ And he said, ‘Meow.’" - Melvin Duguay: Shirley Duguay’s Father
- "We needed to know that some other cat on Prince Edward Island couldn’t have contributed that hair. What if 25% of the cats on Prince Edward Island had the same DNA profile? Or 10%? Or even one in a hundred cats? So that’s the next question you have to ask: ‘What is the frequency of that profile?’" - Marilyn Menotti-Raymond, PhD: Molecular Geneticist
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