What was the name of the horse, Marco Materazzi !!!! Jump jockey Paul O'Neill is being investigated after TV coverage showed him apparently headbutting his mount before a race at Stratford. O'Neill was wearing his riding helmet when the incident took place before the 1510 race at Sunday's meeting. He had been unseated by his horse, City Affair, ahead of a novices' selling hurdle in which they finished fourth. The Horseracing Regulatory Authority will hold an inquiry after examining TV footage of the incident.