"To be honest with you, after 'Rampage,' he was done," Hamill's trainer and manager, Duff Holmes, today told MMAjunkie.com (www.mmajunkie.com
). "He told me, 'I just can't stand the constant pain.'"
The born-deaf fighter suffered several injuries throughout the course of his career in the UFC, including a pinched nerve in his neck that ailed him prior to the Jackson fight. He also re-injured his shoulder, which was separated in his December 2009 fight with now-champ Jon Jones.
"I was ready to make this decision after UFC 130, but my friends, family, coaches and most importantly my daughter encouraged me to give it one last chance," Hamill wrote in his announcement. "My career has been plagued by injuries starting with 'The Ultimate Fighter' and disrupted my training ever since.
"There hasn't been even one training camp where I've been able to train without training around an injury. I have not been kind to my body, and it has nothing left after 28 years of nonstop competition. It's time to finally give it a rest."
Hamill, a lifetime wrestler, and Holmes will continue to train fighters at their gym, Mohawk Valley MMA, in upstate New York.
"I couldn't be prouder of him, and he's taken me on this amazing journey he's been on," Holmes said. "He has nothing to hang his head about."