By Roland Pease BBC Radio Science Unit
Alan Turing, the British mathematical genius and codebreaker born 100 years ago on 23 June, may not have committed suicide, as is widely believed.
At a conference in Oxford on Saturday, Turing expert Prof Jack Copeland will question the evidence that was presented at the 1954 inquest.
He believes the evidence would not today be accepted as sufficient to establish a suicide verdict.
Indeed, he argues, Turing's death may equally probably have been an accident.
What is well known and accepted is that Alan Turing died of cyanide poisoning.
His housekeeper famously found the 41-year-old mathematician dead in his bed, with a half-eaten apple on his bedside table.
It is widely said that Turing had been haunted by the story of the poisoned apple in the fairy tale of Snow White and the Seven Dwarfs, and had resorted to the same desperate measure to end the persecution he was suffering as a result of his homosexuality.
But according to Prof Copeland, it was Turing's habit to take an apple at bedtime, and that it was quite usual for him not to finish it; the half-eaten remains found near his body cannot be seen as an indication of a deliberate act.
Indeed, the police never tested the apple for the presence of cyanide.
Moreover, Prof Copeland emphasises, a coroner these days would demand evidence of pre-meditation before announcing a verdict of suicide, yet nothing in the accounts of Turing's last days suggest he was in anything but a cheerful mood.
He had left a note on his office desk, as was his practice, the previous Friday to remind himself of the tasks to be done on his return after the Bank Holiday weekend.
Nevertheless, at the inquest, the coroner, Mr JAK Ferns declared: "In a man of his type, one never knows what his mental processes are going to do next." What he meant by "of this type" is unclear.
The motive for suicide is easy to imagine. In 1952, after he had reported a petty burglary, Turing found himself being investigated for "acts of gross indecency" after he revealed he had had a male lover in his house.
Faced with the prospect of imprisonment, and perhaps with it the loss of the mathematics post he held at Manchester University, which gave him access to one of the world's only computers, Turing accepted the alternative of "chemical castration" - hormone treatment that was supposed to suppress his sexual urges.
It is often repeated that the chemicals caused him to grow breasts, though Turing is only known to have mentioned this once.
The authorities' continuing interest in Turing became apparent in 1953 when a gay Norwegian acquaintance, Kjell, announced by postcard his intention to visit him at his Wilmslow home, but mysteriously never arrived.