Sir Erec was put down after suffering a fatal injury during the Cheltenham Festival’s Triumph Hurdle.
The contest was marred by the incident that occurred mid-race, with the hot favourite breaking down half-way round the course.
It was subsequently confirmed that the Joseph O’Brien-trained Sir Erec had suffered a fatal injury.
Sir Erec, ridden by Mark Walsh, was well-placed when he pulled up after jumping a fence and it was clear the injury was serious.
He had, prior to the race, been reshoed having lost the shoe on his front-right leg on the way up to the starting flag.
The contest was delayed as a result.
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Pentland Hills eventually won the race, with trainer Nicky Henderson paying tribute to Sir Erec after it finished.
“Sir Erec was a gorgeous horse, he was just stunning,” Henderson said.
“That goes and happens and your heart goes out to them, as JP (McManus, owner) is a good mate and is one of the great men of National Hunt racing.”
Henderson added of the winner: “He nearly fell at the first. I was then thinking, ‘Nicky Henderson, I’m not sure it is a good idea’, but then the rest was good.
“The amazing thing is when he won at Plumpton I was very impressed with him. He was so professional racing, and professional jumping.”