Hall of Fame trainer Jerry Hollendorfer, whose horse Mighty Elijah died on Saturday, has been banned from other parks due to safety concerns.
Emtech, a 3-year-old colt, was euthanized on the track after breaking his front legs. His death came 12 days after another horse's euthanization.
Santa Anita Park has been under fire after an unusually high number of horses died during the racing season.
The famed racetrack outside Los Angeles has come under scrutiny in recent weeks following an unusually high number of equine deaths.
The California racetrack banned same-day medications for horses a week after it suspended races indefinitely.
It's not yet known what has caused the alarming number of injuries at Santa Anita racetrack over the last two months.