TRAINER John Berry paid tribute on Thursday to Christopher Watson, the 61-year-old part-time work-rider killed on Newmarket Heath on Wednesday.
Watson, who travelled from his home in Sapcote, Leicestershire, to ride out one morning a week for the Beverley House trainer, is thought to have been thrown against a tree after losing his left iron on the Berry-owned gelding Kadouchski, while the string was cantering on Side Hill.
Suffolk police and officials from the Health & Safety Executive were continuing to investigate the incident on Thursday. A post mortem will establish the exact cause of death before an inquest is opened.
Watson, a retired businessman, had held an amateur jockey's licence since 1995, but did not ride a winner in 17 mounts under rules in bumpers and on the Flat.
Watson previously rode out for Kevin Morgan, whom he had planned to join as assistant when the trainer moved to Newmarket before finding his ties to the Midlands too strong to sever.
Berry said: "Everyone here is terribly shocked by what was a tragic accident made all the more so by the fact that Chris was such a nice, popular and friendly guy who we all liked very much. He introduced himself to me during the summer, like all amateurs he was looking for places to ride out, and he had fitted in really well.
"The one thing that must be said is that Chris died among friends. The fact that he wanted to drive over from Leicestershire early in the morning once a week shows he really enjoyed coming, he was riding what was probably his favourite horse here, and he died in a place where he was very well liked."
Morgan said: "Chris rode out for me when I was at Waltham on the Wolds, and when I moved to Newmarket he was going to be my assistant trainer, but accommodation was a problem and he decided not to come. Chris was a really nice guy, he loved racing and riding, and I can't believe what's happened."
Jockey Club Estates chief executive, William Gittus, said: "We are all hugely saddened by the accident and wish to send our deepest sympathies to Christopher Watson's family and friends.
"I am very proud of the way Nick Patton and his team out on the training grounds reacted to what was a very difficult situation with speed, professionalism and sensitivity, and we are of course carrying out our own internal investigation and co-operating closely with the police and Health & Safety Executive.
"Safety on the gallops obviously is always of paramount importance to us, but sadly we don't believe anything could have been done to prevent this tragic accident."