Police believe the man was murdered, but a cause and manner of death won't be known until Monday at the earliest.
The man was identified as 48-year-old Adan Fabian Perez, a native of Guatemala. He was a groom at the track. His body was discovered in barn No. 8 by a track security officer shortly before 5 a.m. ET, said Alicia Smiley, a Louisville Metro Police spokeswoman.