When Stephen Seddon crashed his hired BMW into a canal, he was seen as a hero after rescuing his elderly parents from drowning. But just months later Stephen’s parents were found shot dead. It first appeared to police that his father had killed his wife then taken his own life. Detectives had to use all their skills to solve what the judge would call a ‘terrible and unnatural crime.’ Stephen stood to inherit £230,000 but appeared to have a cast iron alibi for the time the murder was committed. Detectives had to work extremely hard to gather the evidence to gain a conviction for Robert and Patricia’s murder.