Jim Redmond, who helped his injured son, Derek, finish his 1992 Olympic 400m semifinal, died at age 81 on Sunday, according to the British Olympic Association, citing family members.

At the 1992 Barcelona Games, Derek pulled his right hamstring 15 seconds into his 400m semifinal, falling to the track in anguish.

He brushed off help from officials, got up and began limping around the track. About 120 meters from the finish line, he felt the presence of an uncredentialed man who rushed down the stadium stairs, dodged officials and said, “We started this together, and we’re going to finish this together,” according to Olympedia.org.

“As I turned into the home straight, I could sense this person was about to try and stop me,” Derek said in an NBC Olympics profile interview before the 2012 London Games. “I was just about to get ready to sort of fend them off, and then I heard a familiar voice of my dad. He said, ‘Derek, it’s me. You don’t need to do this.'”

Derek said he shouted to his dad that he wanted to finish the race.

“He was sort of saying things like, ‘You’ve got nothing to prove. You’re a champion. You’ll come back. You’re one of the best guys in the world. You’re a true champion. You’ve got heart. You’re going to get over this. We’ll conquer the world together,'” Derek remembered. “I’m just sort of saying, ‘I can’t believe this is happening.'”

At one point, Derek noticed stadium security, not knowing who Jim was, having removed guns from their holsters.

“It’s the only time I’ve ever heard my dad use bad language,” Derek said. “He just goes, ‘Leave him alone, I’m his father.'”

Derek told himself in that moment, “I’m going to finish this race if it’s the last race I ever run.” It turned out to be the last 400m race of his career, after surgery and 18 months of rehab were not enough to yield a competitive comeback, according to Sports Illustrated.

Derek had missed the 1988 Seoul Games after tearing an Achilles, reportedly while warming up for his opening race. He looked strong in Barcelona, winning his first-round heat and quarterfinal.

“I’d rather be seen to be coming last in the semifinal than not finish in the semifinal,” he said, “because at least I can say I gave it my best.”