Aristotle Onassis's health deteriorated rapidly following the death of his son Alexander in a plane crash in 1973. He died of respiratory failure aged 69 in Paris on March 15, 1975. His financial legacy was severely limited under Greek law, which dictated how much a non-Greek surviving spouse could inherit. After two years of legal issues, Onassis eventually accepted a settlement of $26 million from Christina Onassis, Aristotle's daughter and sole heir and waived all other claims to the Onassis estate.