A third horse died in three days at Santa Anita when it collided with another horse during training hours on Sunday.
Tikkun Olam, a 4-year-old gelding trained by Eric Kuljac, was euthanized because of his undisclosed injuries. The other horse apparently wasn't injured.
Santa Anita has had five horse deaths since Dec. 26, two days before the winter-spring meet began.
Last year, 37 horses died at the Southern California racetrack. Tikkun Olam's death was the first that occurred on the main dirt surface this year.
A horse died Friday and another died Saturday.