[DouglasKC]

During Thursday's race, one horse in the middle of the pack stumbled into another horse at the bottom of the hill, injuring both. The two horses were humanely euthanized, Stampede officials said in a news release.
A third horse collapsed in the arena at the end of the race. Stampede officials said a veterinarian determined the horse died of natural causes.

Despite the headline that said that three horses died IN THE race....no horses died in the race. Two were injured and were later killed by people. The third one died after the race of natural causes.

[HairOfTheDog]

You're splitting hairs. Two were injured beyond reasonable repair in the race and were put down. One was run and died later from the exertion, he was likely unfit to have run.