Anthony Johnson lost to Daniel Cormier at UFC 210 and promptly retired
"Rumble" Johnson was fighting for Cormier's UFC Light Heavyweight Championship belt in a rematch of the bout for the vacant title two years ago.
But Cormier forced the 33-year-old to submit in the second round and Johnson stunned UFC fans by announcing his retirement minutes later.
"This was my last fight," Johnson said.
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"I didn't even tell [UFC boss] Dana White.
"My coaches knew, my family knew, my friends knew.
"I didn't want it any distractions.
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In his final UFC fight, Anthony Johnson was "outgamed" by Daniel Cormier
"But I have to thank you all for being there for me."
The build-up to the fight was blighted by controversy as Cormier missed weight by 1.2lb before weighing in minutes later on the 205lb limit while appearing to hold onto a taught towel to support some of his own weight.
But the title match went ahead as planned after a brief investigation by the New York State Athletic Commission (NYSAC).
And while it transpired to be Johnson's last competitive fight, he would only hint at his future plans with rumours of him pursuing a career as an American footballer flying around.
"I gave my commitment to another job, something that I've been wanting to do for a while," Johnson added.
"It's not MMA related or something like that.
"It's time for me to move on to something else.
"I'm tired of getting punched by guys and rolling around on the ground with guys and stuff like that.
"Ain't nothing fun about that.
"Thank you everybody.
"I will never ever forget you."