Fourstars Allstar, a star attraction in both New York and Ireland, was euthanized last month after breaking his neck, according to the Racing Post. The 17-year-old son of Compliance, due to stand at Astley Grange Farm Stud this season, was receiving veterinary treatment in Newmarket, England, for a urinary tract problem when he became distressed and injured himself.Astley Grange bought Fourstars Allstar from Irish-based Coolmore Stud late last year.Fourstars Allstar's racing career coincided with that of his millionaire full brother Fourstardave. Leo O'Brien trained the two popular runners in New York for breeder/owner Richard Bomze.Fourstars Allstar won seven graded stakes in North America and was New York-bred Horse of the Year in 1991 and '93. His biggest claim to fame, however, came when he become the first American-trained horse to win a European classic. His victory in the Airlie Coolmore Irish Two Thousand Guineas (Ire-I) for Bomze and partner Philip DiLeo came just a week after a triumph at Belmont Park. Fourstars Allstar returned to New York shortly after.At Saratoga, where Fourstardave has a grade II turf stakes run in his honor, Fourstars Allstar captured two runnings of the Bernard Baruch Handicap (gr. IIT) and the Saratoga Budweiser Breeders' Cup Handicap (gr. IIIT). Fourstars Allstar ended his career in 1995 with 14 wins from 59 races and earnings of $1,596,760. He was sent to Coolmore for stud duty.Fourstars Allstar, who was produced from the Bold Arian mare Broadway Joan, sired English group II winner Jardines Lookout. He also sired two hurdle stakes winners.