Antonya Cooper, 77, made the admission in order to highlight efforts to change the law to allow assisted dying for terminally ill people.
She said her own diagnosis of breast, pancreatic and liver cancer had reinforced her views on assisted dying. "We don't do it to our pets.
Why should we do it to humans?" she told BBC Radio Oxford last week.
Her daughter, Tabitha, said Cooper was "peaceful, pain free, at home and surrounded by her loving family" when she died at the weekend.
"It was exactly the way she wanted it. She lived life on her terms and she died on her terms," she said in a statement to the BBC.
The family had been visited by officers from Thames Valley police after Cooper's interview about her son's death, she added.
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