...ima nominate George Orwell's (1903-1950) proposal to Anne Popham; "How would you like to be the widow of a literary man?"
He had lost his wife a couple of years previously, a tragedy where the surgery was supposed to be routine but she died from a reaction to the anesthetic, and he was prolly lonely. Anne Popham turned him down, as did four others until finally Sonia married him just a few months before his death in 1950. Orwell was only 46 years old when he died, but he had a bleeding lesion in his lung from tuberculosis.
There is speculation that had his success come earlier, he might have been able to afford to take care of himself better, and thus have lived longer...