Tragic news in the horse racing world ... jockey Dean Holland died on Monday after he fell from his horse during an event, officials announced.
He was just 34 years old.
According to Racing Victoria, thoroughbred racing's governing body in Victoria, Australia, Holland was riding in the opening race at Donald Racecourse ... when he and another jockey were thrown from their horses.
Officials say Holland was immediately tended to by medics -- and was slated to be airlifted to Melbourne -- though he ultimately succumbed to his injuries.