Andy Turner was left "devastated" and ready to call time on his career after crashing out in the 110 metres hurdles heats at the Commonwealth Games.
Reigning Commonwealth champion Turner, the England athletics team captain, smacked the first hurdle and, unable to recover, his race was over by the third.
"I am devastated," the 33-year-old said. "I got too close to the first hurdle, hit it, and trying to come back from that is difficult. I hit the second one and that was it. I've no one to blame, it was my fault. I made a crucial mistake and that cost me even finishing the race.
"Defending my title would have been difficult, it's a pretty tough field this time, but to not even make the final, to make such a big mistake when I haven't been making them...I haven't made that mistake all year and to do it here, it's a schoolboy mistake. It's one of the most devastating days on the track."
Turner, who also won European gold in 2010 ahead of taking the Commonwealth crown in Delhi, won bronze at the World Championships the following year, but missed last season with Achilles problems.
He is in the Great Britain team for the European Championships in Zurich next month, but said that could be his swansong.
"I am going to go to the Europeans, in my mind I have been thinking about calling it a day for a while, so if I do after the Europeans I don't know, we'll just have to wait and see how it goes," said the Nottingham athlete, who has a personal training company.
Asked if this could be his last season, he added: "Yeah, I've done well, I've had a good innings, I've been around for 10 years, making championships for 10 years. Although I do feel decent in myself, there comes a time when you've got to start thinking about other things and it's been on my mind for a while now.
"I don't want to go out like this so that's why I am going to go to the Europeans and hopefully get my s*** together."
Turner's team-mates Will Sharman, one of the favourites for gold following the withdrawal of world number one Hansle Parchment, and Lawrence Clark both progressed to tonight's final with second-place finishes, but there was more agony for an established English name in the 800m.
World indoor bronze medallist Andrew Osagie saw his hopes ended by a disqualification after tangling with Wales' Joe Thomas just before they crossed the line.
Osagie appeared to block Thomas off down the inside, but the Essex athlete felt he was the one wronged and hit out at his Welsh rival for protesting, saying on Twitter: "Unbelievable actions to get someone punished despite them not starting the whole thing. Unbelievable decision to allow things to stand #IMO."
A counter appeal from Osagie was dismissed.
Kenyan David Rudisha, whose Olympic gold and world record in London provided one of the highlights of those Games, had no such problems and treated the Hampden Park crowd to a dominant qualifying run, producing a customary display of front-running to reach the semi-finals in one minute 46.89 seconds.
England's Greg Rutherford needed just one attempt to qualify for the final of the long jump, but the Olympic champion was unable to dispel lingering concerns over his fitness.
Rutherford, who has withdrawn from his last two competitions for fitness reasons after struggling with a knee problem, leapt out to 8.05m to seal automatic qualification.
"You want to do as little as you possibly can so to get it done in the first round I'm over the moon with that," the 27-year-old said. "I'm in pretty good form - held together by tape, but feeling pretty good.
"That's always the way of an athlete. There's always ups and downs and hopefully it'll be a good time."
Asked about his knee issue, Rutherford insisted it was no longer an issue but did not sound entirely convincing.
"It's fine, I'm here, I jumped and it's okay," he said. "It's not a problem, definitely not a problem. You manage these things. I'm fine, I'm feeling pretty good."
Eilidh Child, the poster girl of Glasgow 2014, qualified for Thursday night's 400m hurdles final with supreme ease, winning her heat in 55.56.
Elsewhere, England's John Lane, a training partner of Jessica Ennis-Hill, lay third and Ashley Bryant fourth after seven events of the decathlon, while, in the absence of the Olympic champion and Katarina Johnson-Thompson, Jessica Taylor lay third after two events of the heptathlon.