The nanny involved in the scandal remains at large, according to investigators.
A horse died of a suspected heart attack Saturday at Santa Anita, marking the 33rd such death at the Arcadia racetrack since December.
California's governor has signed a law clearing the way for regulators to suspend the horse racing license for beleaguered Santa Anita Park after the death of 30 horses at the famous track.
Another horse died Saturday morning at Santa Anita Park, the 30th such fatality at the race track since Dec. 26, officials said.
Following the death of 29 horses this season at Santa Anita Park, the track has agreed to new safety measures to protect the animals' health.
Two more horses have died at Santa Anita Park, bringing the total number of deaths this season to 29 since late December.
