Medina Spirit, the first-place finisher at this year's Kentucky Derby, collapsed and died Monday after a workout at Santa Anita Park in California, the California Horse Racing Board's Equine Medical Director Jeff Blea confirmed.
The horse was three-years-old.
Trainer Bob Baffert said in a statement that the colt suffered a heart attack.
Per the Paulick Report, Medina Spirit had completed five furlongs in 1:01.40 in his second workout since finishing second in the Breeders' Cup Classic in early November.
“My entire barn is devastated by this news,” Baffert said.