In 2012, Michelle Warner disappeared without a trace after arguing with her live-in ex-boyfriend, Mark Castellano. After initially denying any involvement in Warner’s disappearance, Castellano confessed to her murder. Houston police say that without Castellano’s full confession, they had nothing to keep him in custody and may never have found Warner’s body.

The finale of Dr. Phil’s true-crime podcast, “Twisted Love: Bringing A Murderer To Justice,” Mystery And Murder: Analysis By Dr. Phil, drops Thursday. Listen and subscribe here.