Unsolved Mysteries Rewind 85: The Mysterious Disappearance of Hugh Harlin

On October 13, 1982, in Morro Bay, California, the decomposed body of 43-year-old Dian Harlin was found in a stand of trees next to a beach, strangled with a leash belonging to one of her dogs. Her eccentric 47-year-old husband, Hugh Harlin, had failed to report her missing for eleven days, and given the couple’s turbulent relationship, Hugh became a potential suspect. Four years later, Hugh vanished without a trace, with his abandoned pick-up truck found by the side of the highway. Investigators were unable to determine if Hugh’s disappearance was connected to Dian’s murder, and both cases remain unsolved. On May 3, 1992, in Polk County, Florida, after attending a rodeo, 31-year-old Larry Costine and his 26-year-old girlfriend, Melissa Jo Sermons, returned to Larry’s mobile home. Larry’s nude body was later discovered inside the trailer, having been shot four times, while Jo had gone missing. Initially, investigators suspected Jo had killed Larry and fled, but two decades later, law enforcement announced they believed Jo was also a victim, murdered by the same person who shot Larry. Despite Jo’s ex-boyfriend being the prime suspect, there was insufficient evidence to charge him, and Jo was never found.

Mark and Amy break down the Unsolved Mysteries segment and dive into the entire story. 

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