Michael Owen has described the death of his Classic-winning horse Brown Panther as "the saddest day of my life".
The seven-year-old shattered a hind leg midway through the Irish St Leger at The Curragh and had to be put down.
"The toughest, most honest, most brilliant horse I will ever set eyes on passed away today doing the thing he loved most," said Owen. "It's the saddest day of my life."
Favourite Order of St George was an 11-length winner of the race.
Brown Panther, trained by Tom Dascombe at ex-England footballer Owen's stables in Cheshire, was returning from a leg injury.
He won 11 of his 28 races during a career which also included second place in the St Leger and an eighth-placed finish in the Melbourne Cup.
"I was with him when he was born, shared an experience for seven years that will never be repeated and gave him his last kiss goodbye," Owen said.
"I've not shed so many tears in years but my grief is shared. Life will not be the same without you."
At Longchamp, Treve warmed up for her bid to win a third successive Prix de l'Arc de Triomphe next month by romping to victory in the Prix Vermeille.
The five-year-old filly, trained by Criquette Head-Maarek and ridden by Thierry Jarnet, won by four and a half lengths as the odds-on 2-5 favourite.