The Widower (2014)

Over the course of thirteen years, Malcolm Webster, a seemingly unassuming male nurse, embarked on a chilling spree of deception and murder. He first poisoned his wife, then attempted to replicate his deadly tactics with a second spouse. As his sinister ambitions grew, he devised a new scheme to ensnare his third fiancée in his web of lies. The series unravels the dark psychology behind his actions, revealing a man who meticulously orchestrated a life built on betrayal and tragedy.