Medina Spirit, a 3-year-old colt whose Kentucky Derby victory in May came under scrutiny because of a positive drug test, collapsed and died after a workout Monday at Santa Anita. The horse “allegedly” suffered a heart attack. Santa Anita said in a statement that the track veterinary team took blood, hair and urine samples from Medina Spirit and sent them to the California Horse Racing Board. The colt will undergo a full necropsy, as required by the racing board, to try to determine the exact cause of death.
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