The last remark of On Certainty was written on 27 April, the day before Wittgenstein finally lost consciousness. The day before that was his sixty-second birthday. He knew it would be his last. When Mrs Bevan presented him an electric blanket, saying as she gave it to him: 'Many happy returns', he stared hard at her and replied: 'There will be no returns.' He was taken violently ill the next night, after he and Mrs Bevan had returned from their nightly stroll to the pub. When told by Dr. Bevan that he would live only a few more days, he exclaimed 'Good!' Mrs Bevan stayed with him the night of the 28th, and told him that his close friends in England would be coming the next day. Before losing consciousness he said to her: 'Tell them I've had a wonderful life.'
Ray Monk, in Ludwig Wittgenstein: The Duty of Genious (London: Vintage, 1991.)