Sir Terry Pratchett is to use a prestigious lecture to say that the "time is really coming" for assisted suicide to be legalised.
The author's comments come after two polls found that a majority of people want assisted death to be allowed for the terminally ill.
Sir Terry, who will give the Richard Dimbleby Lecture, will propose that a tribunal should be set up where seriously ill patients can apply for help to die - a legal expert in family affairs and a doctor who had dealt with serious, long-term illness would be part of the body.
The best-selling author, who has Alzheimer's disease, laid out his ideas in the wake of two high profile assisted death cases.
Kay Gilderdale was acquitted of attempted murder after helping her daughter, who was paralysed by ME, to end her life. But Frances Inglis was jailed for a minimum of nine years for murder and attempted murder because she gave her brain-damaged son Tom a heroin overdose.
A YouGov poll commissioned by the Daily Telegraph found that 75% of 2,053 people questioned wanted the law changed to allow assisted suicide, which is currently a crime.
In another survey for BBC Panorama 73% of those questioned said friends or relatives should be allowed to help someone who is terminally ill to commit suicide without fear of punishment. This fell to 48% when the illness was incurable and painful, but not fatal - and 49% said those involved should face prosecution.
Sir Terry will tell an audience at the Royal College of Physicians: "If I knew that I could die at any time I wanted, then suddenly every day would be as precious as a million pounds. If I knew that I could die, I would live. My life, my death, my choice."
He will say that many GPs would support the right to die and that turning to the medical profession to help was "sensible". "I certainly do not expect or assume that every GP or hospital practitioner would be prepared to assist death by arrangement, even in the face of overwhelming medical evidence. That is their choice. Choice is very important in this matter.
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"But there will be some probably older, probably wiser, who will understand. It seems sensible to me that we should look to the medical profession that over the centuries has helped us to live longer and healthier lives, to help us die peacefully among our loved ones in our own home without a long stay in God's waiting room."
