This latest death of a thoroughbred comes at a time when equine fatalities threaten the future of horse racing.

A horse was euthanized April 24 after suffering an injury at Churchill Downs, just days ahead of the 151st Kentucky Derby.

LOUISVILLE, Ky. (WDRB) -- A horse had to be euthanized Thursday morning after getting hurt at Churchill Downs. The racetrack said Valley of Fire, a 3-year-old gelding, had to be put down after ...