Ellie Baxter, 22, recalled how she and her partner used a sledgehammer to smash their way in to her parents' conservatory as they lay slumped in armchairs last year.
Yesterday killer Luke D'Wit, 34, was jailed for life with a minimum term of 37 years.
D'Wit, of West Mersea, Essex, befriended Stephen and Carol Baxter after they employed him in 2012 to create a website for their shower mat company in the yachting village on the Essex coast.
He boasted how they treated him as an "adopted son", while planting a secret camera on which he watched them die after spiking their drink with lethal doses of the super-strength opioid.
The prescription drug is primarily used as a painkiller but is 100 times more potent than morphine.
Oddball D'Wit, who shared a bedroom with his mother at their nearby home, then created a fake will that made him a director of their firm.
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