Kentucky Derby winner Medina Spirit collapsed and died after a workout Monday at Santa Anita.

The 3-year-old colt trained by Bob Baffert had just completed five furlongs in his second workout since finishing second in the Breeders’ Cup Classic a month ago at Del Mar, according to Craig Robertson, Baffert’s attorney.

Santa Anita spokesman Mike Willman also confirmed the colt’s death.

The colt will undergo a full necropsy, which is required by the California Horse Racing Board.

Medina Spirit tested positive after the May 1 Derby for betamethasone, a legal medication that is not allowed on race day.

Last Friday, Robertson released a statement saying that tests done by a New York lab have “definitely confirmed” Medina Spirit tested positive for the steroid not through an injection but due to an ointment used to treat a skin rash.

The Kentucky Horse Racing Commission has been investigating the case, and has yet to hold a hearing that could possibly disqualify Medina Spirit.

Medina Spirit had five wins in 10 career starts and earnings of $3,545,200, according to Equibase. The colt was owned by Amr Zedan, who competes as Zedan Racing Stables.