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fake online personas to manipulate them before he killed them.

These included a doctor from Florida and members of a fake support group for the thyroid condition Hashimoto's, which Mrs Baxter suffered from.

Mrs Baxter, 64, and her 61-year-old husband were found dead at their home in West Mersea in Essex by their daughter Ellie on Easter Sunday last year.

Chilling footage released by Essex Police shows their daughter Ellie, 22, walking up the driveway to the house just moments before finding her dead parents inside.D'Wit was found guilty of the murder of a married couple who he poisoned with fentanyl before changing their will to make him a director of their shower mat company.

He secretly administered the fatal doses and "watched them die" on a secret camera before going into their home and removing incriminating evidence.

D'Wit, of West Mersea, arrived soon after and described himself as a "friend" to a 999 call handler, before calmly giving a false account.

Prosecutors said he created a fake will on his phone the day after the Baxters were found dead, making him a director of their shower mat company Cazsplash.

Another fake persona - a solicitor - was used in connection with the new will, prosecutors said.