http://www.usatoday.com/story/sports...iana/17297979/
According to the article, Jeremy Rose was originally scheduled to ride the horse Montezuma Express but did not show up. Malcolm Franklin then was booked to ride but took off his mounts in the later races because he felt sick. Saez then took the ride late.
Also, contrary to Indiana Grand's original release, Montezuma Express was not euthanized and fortunately is back at his Churchill Downs barn this morning with only cuts but otherwise seems to be fine.
Horrifically tragic.