CYPRESS—Officials released more details today on the death of a racehorse who was injured at Los Alamitos Race Course. Steamy was a three-year-old filly who died May 4, according to the California Horse Racing Board, which listed her death as racing-related. Her last race was April 30 at Los Alamitos, when she finished last in the seven-horse field, although the race chart made no mention of an injury. “Steamy sustained a back injury during the race that became apparent when she was returned to the barn and worsened over time to require euthanasia on the morning of May 4,” Mike Marten, spokesman for the CHRB, told City News Service. Los Alamitos officials did not respond to a request for comment. Steamy had seven races and one first-place finish in her racing career. She was bred and owned by Ed Allred, who also owns the Los Alamitos track. She was trained …