DAME Prue Leith says her brother had a perfect death as he was pumped full of morphine to put him out of his pain.
Great British Bake Off judge Prue, 83, said most doctors now refused to over-administer the drug for fear of being sacked.
Speaking out to back a Scots campaign for legalising assisted dying, she said: “Most doctors won’t do that — most doctors pre-Harold Shipman would see their patients off when it was agreed.
“There’d be a nod and a wink from the family.”
Dame Prue has campaigned for legalised assisted dying since her other brother’s death in 2012, when he “endured weeks of agony.”
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She added: "When the morphine worked he was fine but the morphine only worked for three hours, not four, so for one hour in ever four he would be in screaming agony.
"And so when you see that and the effect it has on his children, his family, it is just horrific and so that got me on it."
Prue’s son, Daniel Kruger, Tory MP for Devizes, Wilts, opposes her view.
Prue explained: "My chief opponent in this is my son."
"He worries a lot about people who are vulnerable or who might be coerced and might not have the agency to look after themselves and have their minds made up by grasping bureaucrats who want to free up beds in hospitals.
"But I think because he is religious it's hard for him.
"But I can't see a God, any God, who wants to see people suffer.
"It seems an odd thing to put on your god but I'm not religious so I don't understand how these things work."