Cornerstone Spendthrift Farm Sire Malibu Moon Dies At Age 24 Sponsored by: Malibu Moon Malibu Moon, the foundation sire of B. Wayne Hughes' Spendthrift Farm, died suddenly on Tuesday in his paddock of an apparent heart attack. The distinguished son of A.P. Indy was 24. “He started Spendthrift for us,” said Hughes, founder of the modern-era Spendthrift. “Without Malibu Moon, we are not where we are today. It takes a special horse, and he was just that. This is a sad day.” A perennial leading sire in North America, Malibu Moon has been a staple of the Thoroughbred industry for the better part of this century, significantly influencing the breed through his sons and daughters on both the racetrack and in the breeding shed.