Bromley was in contention for a medal after a great opening run
Britons Kristan Bromley and Adam Pengilly saw their dreams of Olympic medals in the skeleton fade away.
Bromley, boyfriend of Shelley Rudman who scooped the women's silver, slumped from third to fifth with a combined time of one minute 57.10 seconds.
Surprise package Pengilly, fourth after the first run, finished eighth.
Duff Gibson clocked 1:55.88 for gold, 0.26 seconds ahead of Canadian team-mate Jeff Pain, while Swiss challenger Gregor Steahli took bronze.
Bromley and Pengilly had surged into contention after blistering first runs but fell away as the event drew to close.
Bromley, nicknamed 'Dr Ice' after designing his own sled, could only manage seventh fastest on his second run and subsequently dropped to fifth place.
"I have mixed feelings," said the 33-year-old. "I'm very disappointed not to get a medal - I felt from the first run, I could have gone for second place.
"But I am also pleased we and team GB have put on a good show."
Pengilly, 28, was also disappointed but believed the result was a promising sign for the future.
"I'm gutted," he said. "I had the opportunity and didn't take it.
"I should have done better and I'm thoroughly annoyed at myself.
"I only started sliding four years ago and targeted Vancouver 2010 as my medal chance.
"So in that respect I'm ahead of schedule, but that doesn't make up for this which is an opportunity I missed."
Gibson, 39, announced his retirement after becoming the oldest individual gold medallist in Winter Olympic history.
"I think it is a well-known fact that I am not the youngest guy in the sport, and the important thing for me was to go out on top," he said.
"Winning is exactly how I dreamt it would feel. I vividly remember when I was 10 watching the Montreal Games - and I wanted to be a part of it."