LONDON (AP) Many Clouds, the winner of Britain's 2015 Grand National, collapsed and died after producing one final stunning victory on Saturday.
At Cheltenham, Many Clouds shocked Thistlecrack to win the Cotswold Chase by a head before falling after the winning post. He was treated by veterinary staff before his death was confirmed.
''We've got to look forward and not look back,'' trainer Oliver Sherwood said. ''He's been the horse of a lifetime and I always said he would die for you and he's died for me and the team today doing what he does best.
''He wanted to win that race. He was beaten and then fought back in the last 50 yards to win.''
Many Clouds was owned by Trevor Hemmings and ridden by Leighton Aspell, who was also on board for the 2015 victory in the Grand National - the world's most grueling horse race.
''The public get to know the horses, especially horses that try for you,'' Sherwood said. ''They appreciated what he had done and he captured your imagination.''
The British Horseracing Authority said it could not be certain of the cause of the incident.
''Steps will be taken to understand exactly what has happened,'' BHA spokesman Robin Mounsey said. ''Incidents such as this are exceptionally rare.''