Purr-fect Match

Snowball helps solve Shirley Duguay's murder

Image credit: Episode screen capture from Forensic Files

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

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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?

Shirley struggled to raise her five young children alone
Image credit: Episode screen capture from Forensic Files

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

Doug Beamish was really the only one suspected in Shirley's murder
Image credit: Episode screen capture from Forensic Files
  • "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

Last Words

It’s sad, but it’s another case where a known domestic abuse victim eventually becomes a murder victim. The occurrence of this fact chain is startling common. This case’s investigation unfolded in stages:

Hyperflexed toes and pronated feet helped identify Doug's shoes
Image credit: Episode screen capture from Forensic Files
  • First, Shirley goes missing, but no one reports it for four days. It was said her venturing off wasn't a surprising occurrence, but I would think the mother of five children between the ages of 8 and 15 would keep those close to her informed.
  • Then the abandoned car is located with medium velocity impact spatter, and the blood-soaked pillow she sat on to drive. Shirley was only 4'9” and weight under 100 pounds.
  • Soon after, the police found the shovel with two black hairs just half a mile from Shirley's vehicle. One would think that Doug wouldn't have taken Shirley's body too far from the murder site before burying it, and I might guess he left the shovel after burying her (though when her body is found, it's hardly buried).
  • Weeks later, investigators found the bag – a treasure trove of potential evidence. 15 miles from the car would indicate it was discarded at a subsequent time, since Doug probably didn't walk the distance. The blood-stained leather jacket and the shoes were exactly the type of evidence that more care should have been taken in disposing.  
  • Finally at the seven-month mark, Shirley's body was located. The authorities had a pretty solid case against Doug by that time, with the cat hair DNA tying him to the jacket, and the forensic footwear evidence showing he owned the shoes.

Doug Beamish‘s brutality was affirmed with the autopsy reporting which showed Shirley’s jaw broken in three places and one of her teeth lodged in her own lung. Doug’s motive was affirmed when it was learned he’d rather see Shirley dead than for her to have custody of their children. They had been separated for 18 months by this time, but the threat was written in Doug’s own blood. That’s frightening. And almost as frightening, the Canadian justice system only gave Doug a sentence of 18 years. I’m probably used to the American courts where a murderer gets 30 years (and gets out in 6). Perhaps Doug will serve his entire sentence. Perhaps prison in Canada focuses more on rehabilitation than punishment.

Animal DNA went on to become an important forensic tool for investigators
Image credit: Episode screen capture from Forensic Files

With a title like “Purr-fect Match”, it was obvious this episode was going to focus pretty heavily on the cat, Snowball. These are so many cases/episodes where dog or cat hair is among the evidence that helps tied suspects or victims to locations. Having owned cats on and off for years, I know how pet hair can collect and travel. It’s not often that the animal’s hair is typed for DNA, and this was the first case where animal DNA was used to convict in a murder trial.

Snowball was significant to me directly – I’ve owned not one, but two different pure white cats before. I got Loki as a kitten in the late 1990s and enjoyed his companionship for 11 years. But his heterochromia iridum (two different-colored eyes, blue and green) didn’t make him special, his chill demeanor did. Years later, I adopted the pure white cat of a domestic partner – it was like déjà vu. And this new frosty feline had an appropriate name: Snowflake. So, seeing Snowball (of course, played by an cat actor) being carried in a cage and getting his blood drawn made me a little squeamish.

Finally, how cool was Melvin Duguay? For a gentleman who’d lost his daughter and probably at least shared a hand in raising her five young children after her demise, Melvin had a lot of poise and composure, giving a great interview. Between sorrow at the loss of his __ and the anger at her abusive partner, Melvin also shared a bit of humor. I adored his recounting of the apprehension of Snowball for evidence collection (quoted above).

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Author Robert S. profile image
Robert S.
I've been a fan of Forensic Files since the show's inception, and it is still my favorite true crime series. I have seen every episode several times, and I am considered an expert on the series and the cases it covers.