Killer Trials: Judgment Day S01 E08 The Killer Next Door [The Salt Lake Slayer]

Graeme Cunningham leaves his home and vanishes. His panicked mother, Shona calls the police. After they fail to shed any light on his disappearance, veteran detective Don Bell is enlisted to work on the case. After several dead ends Don is alerted to a mild mannered bookkeeper, Arthur Bishop. Don discovers Bishop is a thief, a fraudster, and has been molesting Graeme's friend.