Kelly Marie Cochran pled guilty, in April, to smothering her husband Jason Cochran on Feb. 20, 2016. She was already serving a life sentence for helping her husband kill and dismember her boyfriend. Those may not be only murders the Indiana woman has committed, according to a Dead North, Investigation Discovery’s upcoming true crime documentary. The two-night special premieres on Monday, May 28 and Tuesday, May 29 at 9 p.m.

“When Laura Frizzo, the lone female police chief in the isolated, relentlessly cold world of Michigan’s Upper Peninsula, began an investigation to find missing person Chris Regan, she never expected to uncover an alleged female serial killer as well,” reads Investigation Discovery’s press statement.

Iron River Police Chief Laura Frizzo was stationed in the Upper Peninsula of Michigan when a tip came in that Chris Regan went missing. She began her investigation on October 27, 2014. Kelly Cochran had been having an affair with Chris and may have been the last person to see him. The following day, Frizzo met with Kelly and her husband Jason Cochran in Hobart, Indiana.

Jason was found dead of a suspected overdose in February 2016. The Indiana Lake County Coroner discovered Jason didn’t overdose. He was murdered, cause of death: asphyxiation.