On Friday the 13th, Christine Markle and her daughters are found murdered. A signed confession points to John Markle, but the blood-stained Halloween mask left at the scene raises haunting questions. Watch “The Friday the 13th Murders” Wednesday on ID. | Investigation Discovery
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When his mom was killed, his dad stood trial for her murder... what kind of fallout has he and his family experienced? Check out this exclusive preview of A Murder in Mansfield and tune in tonight at 9/8c. | Investigation Discovery
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