The horse that died at this year’s Rolex Kentucky Three-Day Event succumbed to an abdominal hemorrhage, according to a statement from Canadian Eventing Team Veterinarian Christiana Ober, DVM, released via Equine Canada.

Kingpin, a 13-year-old Irish Sport Horse gelding ridden by Canadian Mike Winter, collapsed on landing after negotiating cross-country fence 10. He died on the scene.

“Kingpin suffered a hemorrhage of the large vessels in the abdomen unrelated to any jumping effort or trauma,” Ober said. “This is a very rare condition and the actual cause is unknown.”

Kingpin and Winter finished 12th at Rolex in 2008. They also completed competition at the Olympics in Hong Kong in 2008, and finished eighth individually at the at the 2007 Pan American Games in Rio de Janeiro