Jockey Victor Espinoza was injured when the horse he was riding at Del Mar racetrack collapsed during training and died.
Racetrack officials say Bobby Abu Dhabi suffered an apparent fatal heart attack during a workout Sunday morning. Espinoza was thrown off the horse, then lay motionless for several minutes before being fitted with a neck brace and taken by ambulance to a hospital.
Agent Brian Beach says the Hall of Fame jockey, 46, suffered a fractured vertebra in his neck and a stinger to his left shoulder and arm. He says Espinoza will remain in the hospital overnight, but doctors expect a full recovery.