Podcast:Someone Knows Something Published On: Mon Jan 02 2017 Description: David tracks down Michael Lavoie's stepbrother, Mark Dempsey, and talks to him about family, betrayal and the criminal code. For transcripts of this series, please visit: https://www.cbc.ca/radio/sks/season2/someone-knows-something-season-2-sheryl-sheppard-transcript-listen-1.3846237