Final Justice: The Murder of Guylaine Potvin

Final Justice: The Murder of Guylaine Potvin

Author: Dark Poutine / Curiouscast June 2, 2025 Duration: 55:08
Episode 369: In the quiet city of Jonquière, Quebec, the brutal 2000 murder of 19-year-old Guylaine Potvin sent shockwaves through her community and left investigators baffled for over two decades. For years, the case grew cold, with few leads and little hope for justice. But in 2022, a remarkable breakthrough in forensic science and persistent detective work finally led to the arrest of Marc-André Grenon, a man whose name had lingered on the periphery of the investigation for years. This episode takes you inside the investigation, the science that cracked the case, and the long-awaited trial that brought answers to a grieving family. Sources:⁠2024 QCCS 551 (CanLII) | R. c. Grenon | CanLII⁠⁠2023 QCCS 5152 (CanLII) | Grenon c. R. | CanLII⁠⁠Indigenous Tourism Quebec - Region - Saguenay, Lac-Saint-Jean⁠⁠Jonquière | Saguenay River, Fjord, Pulp & Paper | Britannica⁠⁠Jonquière, Québec, Canada genealogy project⁠⁠Jonquière | Wikipedia⁠⁠Crown, defence agree accused killed teen in cold case from 2000 but disagree on intent | CBC News⁠⁠WyndhamForensic_Presentation_DNAAnalysis⁠⁠The scientific reinvention of forensic science⁠⁠The False Promise of DNA Testing⁠⁠Procès de Marc-André Grenon : l’accusé ciblé en raison de son nom de famille⁠⁠Quebec cold case murder trial: Crime scene photos show 19-year-old victim's life⁠⁠Quebec police officer sat beside cold case suspect in movie theatre to get his DNA, trial hears | CBC News⁠⁠Crown says suspect in Quebec cold case murder tracked down by Y chromosome project⁠⁠Après 22 ans, un homme sera accusé du meurtre de Guylaine Potvin à Jonquière⁠⁠Project Surname | The Canadian Encyclopedia⁠⁠35 ans après Polytechnique : la sœur de Guylaine Potvin veut qu’on se souvienne⁠⁠Marc-André Grenon admet avoir causé la mort de Guylaine Potvin⁠⁠Meurtre de Guylaine Potvin | Marc-André Grenon a sévi une seconde fois en 2000⁠⁠Condamné pour le meurtre de Guylaine Potvin: Marc-André Grenon reconnaît avoir frappé une deuxième fois en 2000⁠ Learn more about your ad choices. Visit megaphone.fm/adchoices

Podcast Episodes
Buried Evidence: The Murder of Erin Chorney [not-audio_url] [/not-audio_url]

Duration: 1:09:35
Episode 344: In 2002, Brandon, Manitoba, was rocked by the disappearance of Erin Chorney, a feisty and energetic teenager with her whole life ahead of her. What began as a simple outing—Erin telling her mother she'd be b…
Remembrance Day 2024: More Badass Canadians at War [not-audio_url] [/not-audio_url]

Duration: 1:02:04
Episode 343: This is our special Remembrance Day episode. Each year on November 11, Canadians pause to remember the sacrifices made by those who served in the armed forces, defending our country and our allies with incre…
Still on the Run: The Murder of Krystal Senyk [not-audio_url] [/not-audio_url]

Duration: 1:06:20
Episode 342: In the quiet Yukon community of Carcross, a chilling tragedy unfolded on March 1st, 1992, forever changing the lives of those involved and leaving a lasting impact on the region. Krystal Nicole Senyk, a twen…
Satanic Panic: A Canadian Export [not-audio_url] [/not-audio_url]

Duration: 1:05:46
Episode 340: In the early 1980s, a wave of fear with its origins in Canada, swept across North America, igniting what would become known as the Satanic Panic. This moral hysteria, fueled by sensationalized media reports…
Cybercrime in Canada: Staying Safe Online [not-audio_url] [/not-audio_url]

Duration: 49:33
This bonus episode of Dark Poutine is brought to you by MasterCard. In this special episode, we’re exploring a growing threat hitting more close to home than ever—cybercrime. We’ve dived deep into all sorts of dark tales…
BC’s Last Man Hanged — The Tale of Leo Mantha [not-audio_url] [/not-audio_url]

Duration: 56:11
On the night of September 6, 1958, Aaron “Bud’ Jenkins was stabbed to death as he slept in his barracks at the Naval base in Esquimalt on Vancouver Island here in British Columbia. A man named Leo Mantha confessed to the…
Cold and Dark: The 1998 Quebec Ice Storm [not-audio_url] [/not-audio_url]

Duration: 1:02:17
Episode 338: The Great North American Ice Storm of January 1998 was a devastating natural disaster caused by five consecutive ice storms affecting eastern Ontario, southern Quebec, New Brunswick, Nova Scotia, northern Ne…
Valentine’s Day Nightmare: The Murder of Betty Hart [not-audio_url] [/not-audio_url]

Duration: 1:05:02
On the evening of February 14, 1985, Valentine’s Day, at around 6:00 p.m., Bryan Hart of Colborne, Ontario, came home to a quiet house after work. He looked around the house for his wife, Betty, but could not find her. T…
Murder in Fort Mac: The Case of Robert LeVoir [not-audio_url] [/not-audio_url]

Duration: 1:15:30
In November of 2002, friends and family of 25-year-old Fort McMurray DJ Robert LeVoir became concerned that they hadn’t heard from him in over two weeks. Although he’d been a troubled guy, struggling with drugs, cocaine…