
This episode covers the chilling case of Ian Stewart, who murdered his fiancée Helen Bailey in 2016 and was later convicted for the murder of his first wife, Diane Stewart.
The episode begins with Helen Bailey's disappearance in Hertfordshire, England, reported by her fiancé Ian Stewart. Police later discovered her body in a cesspit at their home, raising questions about Stewart's behavior during the investigation.
Key discussions include the timeline of events leading up to Helen's murder, with insights from experts like Parm Sandhu and Geoffrey Wansell. They highlight Stewart's suspicious actions, such as disposing of a duvet and altering financial arrangements shortly after Helen went missing.
The narrative shifts to Diane Stewart's death in 2010, initially ruled as an epilepsy-related incident. The episode reveals how Ian Stewart's actions and the subsequent investigation into Helen's murder prompted authorities to re-examine Diane's case.
Ultimately, Ian Stewart was convicted of both murders, with the episode detailing the emotional impact on the victims' families and the community's shock at the revelations about a seemingly ordinary man.
Ian Stewart murdered his fiancée Helen Bailey and was later convicted for the murder of his first wife Diane Stewart.

This episode stands out for the following:
The writer's happy ending had turned to tragedy.The Devious Crimes of Double Murderer Ian Stewart | World's Most Evil Killers | True Crime
You do not have to say anything.The Devious Crimes of Double Murderer Ian Stewart | World's Most Evil Killers | True Crime
It's a particularly gruesome, grisly place to find a woman's body.The Devious Crimes of Double Murderer Ian Stewart | World's Most Evil Killers | True Crime
He thought he was above it all.The Devious Crimes of Double Murderer Ian Stewart | World's Most Evil Killers | True Crime
What makes Ian Stewart so evil is he looks like any man.The Devious Crimes of Double Murderer Ian Stewart | World's Most Evil Killers | True Crime