Max Whitlock's Olympic career ended with a fourth-place finish on the pommel horse, as Rhys McClenaghan won Ireland's first gymnastics gold.
The 31-year-old Whitlock had aimed to win a third consecutive gold on the apparatus.
What happened?
Whitlock struggled with his routine, scoring 15.200, behind McClenaghan's 15.533 and Nariman Kurbanov's 15.434.
He was surpassed by Stephen Nedoroscik, who claimed bronze with 15.300.
Why it matters for Max Whitlock
Whitlock retires as Britain's greatest male gymnast, with six Olympic medals, including gold on the floor at Rio and a historic all-around team bronze at London 2012.
He had reversed his decision to retire after Tokyo, but Paris was his final Games.
Whitlock reflected on his career, saying it's "so raw, it's tricky" to put the disappointment into words.
What comes next?
Whitlock will need time to reflect on his career, having never done so before, and is proud to have done gymnastics at this level for so long.
He dreamed of winning an Olympic medal at 19 and is happy to have six medals.
Whitlock increased his difficulty from qualifying but his execution was not perfect, ruling him out of gold medal contention.
He was "kicking myself watching everyone else going up after me," and wishes he could clean up a few errors.
The Northern Irishman McClenaghan had become Ireland's first world champion at gymnastics since Tokyo and set the highest score in qualifying.
There were just 0.034 points to separate them coming into the final, but the picture quickly changed when Kurbanov went first and set an imposing score.
Whitlock's final routine marked the end of an era for British gymnastics, and he will be remembered as one of the greatest.