Ray Gosling, 70, was held by police after admitting he smothered his unnamed partner with a pillow as he lay dying in hospital.
The award-winning documentary maker made his confession during a broadcast on BBC East Midlands' Inside Out programme on Monday. He said he carried it out to fulfil a pact they had made in case the pain got too severe.
He repeated the claim on Radio Four's Today programme yesterday morning.
Gosling said he would not name his lover nor say when the incident took place. Police said they only found out about the case after Gosling's comments were broadcast on Monday.
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