The finale. The aftermath of Ringel's trial, what happened, and what was learned. David and Mary Ann embark on a search for Chrissy’s body.

Watch David Ridgen's original television documentary from 2012, 'Confession to Murder Part I' and 'Confession to Murder Part II'.

David’s TV documentary about Christine comes out in the spring of 2012, publicly revealing details of the case for the first time along with key interviews including a face-to-face with Anthony Ringel. In the aftermath, police launch an undercover operation on Ringel. David and Mary Ann's work proves key and Ringel is re-arrested. Will Ringel finally go to trial and Mary Ann learn the truth?

The case against Anthony Ringel falls apart and he is freed. And Mary Ann says she's been kept in the dark. How did it happen, and is Anthony Ringel even guilty of what he says?

A decade after her disappearance, a previously uninvestigated local man comes forward at a family gathering and confesses to killing Christine Harron. Chrissy's mother Mary Ann is told that the case is a "slam dunk". And the outcome of an upcoming trial could mean she will finally learn the truth. But this is just the beginning.

Chrissy Harron didn’t feel well on May 18, 1993, and stayed home from school, but eventually her mother insisted that she get to afternoon class. Chrissy left, slamming the door, and would never be seen again. How can someone simply vanish, and did the local police find anything of use in their investigation?

New episodes will be released weekly on Wednesdays. Don't want to wait? Binge the whole season right now via CBC True Crime Premium on Apple Podcasts.

David Ridgen joins Kathleen Goldhar on the Crime Story podcast to give a behind-the-scenes look at the investigation for Season 9 of Someone Knows Something: The Christine Harron case.

Hear the full interview on Crime Story, where subscribers can get early access to Episode 1 of the new season of Someone Knows Something. You can also find Episode 1 of the new SKS season right now on YouTube (where you'll be able to watch Kathleen's interview with David) or available Nov. 6 right here in the SKS feed.

Someone Knows Something host David Ridgen's latest investigation is 15 years in the making. Season 9 follows the story of Ontario teenager Christine Harron who disappears in 1993. A mysterious man confesses to her murder, but the police case stalls out — and then David steps in.

Episodes will be released weekly starting Wednesday, Nov. 6. Subscribe to CBC True Crime Premium on Apple Podcasts to get all episodes early and ad-free.

"Come Forward": Ken Dauphinais is back in court facing serious charges. David investigates what this might mean for Sue Martin and her daughter Terrie's murder case.

“Panic Mode”: An undercover police investigation appears to go south. The clock ticks on a criminal trial.

“Homefront”: David digs into the original investigation into Terrie’s murder. Was anything missed? And what did one of the children see?