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b'When Iron River, Michigan, police responded to a missing persons call, Chief\\xa0Laura Frizzo had no idea it would start her on a years-long trail that would lead to a suspected serial killer. Kelly Cochran later told a detective she has murdered as many as 21 people, including two husbands. Frizzo, who lost her job as chief in a dispute with a city council member, is the host of an Investigative Discovery documentary about the case.\\xa0Frizzo is Nancy Grace\'s guest in this episode, along with lawyer & psychologist Dr. Brian Russell, host of Investigation Discovery\'s "Fatal Vision" series, forensic expert Joseph Scott Morgan, and\\xa0DailyMail.com\'s Sean Walsh.'