This Friday, March 21, 2025, at 9/8c, Dateline NBC presents “Poison Twist”, a compelling investigation into the case of Kaitlyn Conley, a New York woman convicted in the poisoning death of her ex-boyfriend’s mother, Mary Yoder.

In 2017, Conley was found guilty of manslaughter after Mary Yoder died from poisoning, but even as she serves her sentence, Conley maintains her innocence. Dateline reports on this fascinating case, examining the twists and turns that led to Conley’s conviction.

The story began when Conley worked as an office manager for Mary’s family chiropractic business. After a tumultuous relationship with her ex, Adam Yoder, Conley became embroiled in the tragic death of his mother. The police initially considered Adam a suspect, and Conley herself wrote an anonymous letter to the police, which led them to her as a possible suspect. During her interrogation, Conley’s behavior raised suspicion, and her comment about poison...