The Perfect Murder - Season 3 - Eps 10: Murder-in-Law
When Dallas mother Nancy Lyon dies of a mysterious illness in 1991, her wealthy father tells police she was poisoned by her own husband. But the case is far from closed, and the investigation will uncover family secrets with shocking implications.
About The Perfect Murder

Title: The Perfect Murder
First Air Date: 2014-04-20
Last Air Date: 2018-09-27
Status: Ended
Rating: 8.3/10 (from 10 votes)
Language: EN
Seasons: 5
Total Episodes: 49
Network: Investigation Discovery
Genres: Crime, Documentary
Production Companies: Kaufman Films
Synopsis
"The Perfect Murder" brings viewers some of the most diabolical, perplexing murder cases to land on detectives’ desks – the kind of cases that make or break careers and provide fodder for Hollywood mystery movies. These ingenious killers are every detective’s worst nightmare. Whether by planting false evidence, or writing anonymous letters to police, these murderers will stop at nothing to stay one step ahead and get away with the perfect murder. Detectives hit dead end after dead end, and wrong suspects are discarded. But one new clue can lead to another and the cold case suddenly gets hot. The truth is that it is the perfect murder -- until it's not.
Cast

Bill Graves
Narrator (voice)