
This episode covers the mysterious death of Janet Overton, the investigation into her husband Richard Overton, and the eventual revelation of cyanide poisoning.
Janet Overton collapsed and died in 1988, leaving no clear cause of death after an autopsy. Her husband Richard, a computer consultant, had a troubled past, including a previous marriage where he was accused of poisoning his ex-wife Dorothy Boer.
Investigators revisited Janet's case after Dorothy's testimony about Richard's past. They discovered troubling entries in Richard's diaries, which suggested a deteriorating relationship with Janet and potential motive.
Forensic tests eventually revealed cyanide in Janet's system, leading to the conclusion that she had been poisoned shortly before her death. Richard was found to have had access to cyanide through a friend who owned a mine.
After a lengthy investigation, Richard Overton was charged with first-degree murder and found guilty, receiving a life sentence without parole.
Janet Overton's mysterious death led to Richard Overton's conviction for murder after cyanide poisoning was discovered.

This episode stands out for the following:
Her death would have remained a mystery had it not been for a telephone call.Forensic Files - Season 7, Episode 31 - Sniffing Revenge - Full Episode
The love-hate relationship between Jan and I has turned to pure hate.Forensic Files - Season 7, Episode 31 - Sniffing Revenge - Full Episode
I felt a great sense of relief that justice indeed had been served.Forensic Files - Season 7, Episode 31 - Sniffing Revenge - Full Episode