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 | CanLII () 2023 QCCS 5152 (CanLII) | Grenon c. R. | CanLII () Indigenous Tourism Quebec - Region - Saguenay, Lac-Saint-Jean () Jonquière | Saguenay River, Fjord, Pulp & Paper | Britannica () Jonquière, Québec, Canada genealogy project () Jonquière | Wikipedia () Crown, defence agree accused killed teen in cold case from 2000 but disagree on intent | CBC News () WyndhamForensic_Presentation_DNAAnalysis () The scientific reinvention of forensic science () The False Promise of DNA Testing () Procès de Marc-André Grenon : l’accusé ciblé en raison de son nom de famille () Quebec cold case murder trial: Crime scene photos show 19-year-old victim's life () Quebec police officer sat beside cold case suspect in movie theatre to get his DNA, trial hears | CBC News () Crown says suspect in Quebec cold case murder tracked down by Y chromosome project () Après 22 ans, un homme sera accusé du meurtre de Guylaine Potvin à Jonquière () Project Surname | The Canadian Encyclopedia () 35 ans après Polytechnique : la sœur de Guylaine Potvin veut qu’on se souvienne () Marc-André Grenon admet avoir causé la mort de Guylaine Potvin () Meurtre de Guylaine Potvin | Marc-André Grenon a sévi une seconde fois en 2000 () Condamné pour le meurtre de Guylaine Potvin: Marc-André Grenon reconnaît avoir frappé une deuxième fois en 2000 ()
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