Overview

• Luke D'Wit, 34, was convicted for the murder of Stephen and Carol Baxter, who he poisoned with fentanyl in Essex.
• D'Wit created fake online personas, including a doctor and a support group member, to manipulate the couple.
• He altered the Baxters' will to make himself a director of their shower mat company, Cazsplash.
• The couple was found dead by their daughter on Easter Sunday last year, sparking the investigation.
• Detectives described D'Wit as one of the most dangerous men they've encountered, highlighting his potential for further crimes if not caught.