New developments in Mary Yoder poisoning case reported

A new episode of "Dateline" airs tonight, focusing on the Mary Yoder poisoning case. The episode is titled "Poison Twist" and revisits the mysterious death of Yoder, a healthy 60-year-old woman who died in 2015. Investigators found that Yoder was poisoned. They suspected Kaitlyn Conley, who worked as a receptionist in Yoder's office and dated Yoder's son, Adam. Conley has always claimed she is innocent. Her first trial ended without a verdict due to a hung jury. In her retrial in 2017, she was convicted of manslaughter. Tonight's episode reveals new updates in the case, including discussions about possible new charges against Conley. "Dateline" correspondent Andrea Canning reports that the episode will feature interviews with Conley, Yoder’s family, and Conley’s appellate attorney. Viewers can watch "Poison Twist" tonight at 9 p.m. ET/PT and 8 p.m. CT on NBC. The episode will also be available for streaming on Peacock the following day.