(CNN)Two racehorses died Saturday at Pimlico Race Course, site of the Preakness Stakes to be held later in the day.
Homeboykris collapsed after the first race of the day while walking back to his barn. The horse, a 9-year-old gelding, won the race at the Maryland track in Baltimore.
Trainer Francis Campitelli was in the stands when his horse went down.
He told The Baltimore Sun, “The boy that takes care of him said they had gone probably 100 yards, and he got wobbly and fell over and he pretty much was dead when he hit the ground.”
Campitelli said they thought the horse was in “really good health” and why he died was still a bit of a mystery.
“They’re thinking at this point it was some sort of heart attack … ruptured aorta or something like that,” he told the Sun. We won’t know until they do a necropsy on him, just to find out exactly what happened.”
Pramedya, a 4-year-old filly, fractured a cannon bone in her leg while running on grass in the fourth race and was euthanized on the track. Jockey Daniel Centeno broke his collarbone in the fall.
The horses will have necropsies performed at New Bolton Center Hospital in southeastern Pennsylvania, Pimlico spokesman David Joseph said.
Mike Hopkins, executive director of Maryland Racing Commission, said those tests usually take seven to 10 days.
“It really is unfortunate,” he told CNN. “We at the Maryland Racing Commission take safety and integrity very seriously and we conducted thorough examinations and inspections before every race, as well as after every race. We have several veterinarians on-staff and on-site, and we inspect them in the barns, in the paddock, and at the starting gate.”
Pramedya is owned by Roy and Gretchen Jackson, who owned Barbaro, the 2006 Kentucky Derby who pulled up lame during the Preakness. He underwent eight months of veternary care but was euthanized in in January 2007. Pramedya had won two of her first four career starts, including one race this year.
Homeboykris had run 62 races before Saturday, winning 13 and finishing in the top three 28 times. He finished 16th in the 2010 Kentucky Derby.