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A closer look at the case of Darren Byrne, a former city trader who killed his wife then tried to burn down the family home after she discovered he was having an affair.
The story of volatile former chef Robert Trigg, who was found guilty killing two of his former girlfriends five years apart.
In 2011 Julie Dixon murdered her fiance David Twigg by locking him in a cupboard and starting a fire. But she told police it was part of a suicide pact.