Mathieu Baudry apologised to his Leyton Orient team-mates after he missed in the League One play-off final shootout loss to Rotherham.
Millers goalkeeper Adam Collin palmed away Baudry's tame effort and then followed it up with another decisive save from Chris Dagnall to send the Millers up and keep Russell Slade's men in League One, which they topped for 22 weeks of the regular campaign, for another year.
Orient must have thought they had one foot in the Championship as they led 2-0 at half-time through goals from Moses Odubajo and Dean Cox, but former striker Alex Revell broke their hearts after the break with two quickfire goals.
While Collin was left to receive the adulation of his team-mates, Baudry's emotions were at the other end of the scale.
"Everyone is really sad, we gave everything and we are unlucky to be on the losing side," the Frenchman said.
"We were disappointed to allow them back into the game, but I am proud of us and what we have done this season.
"I was confident with the penalty, they are a bit of a lottery. But I missed it and I am devastated. I feel like I let down the boys and I am sorry I have let them and the supporters down."