The past year was undoubtedly the biggest in history for the sport of mixed martial arts.
Both the UFC and Bellator held more events than previous years and their long-term futures are bright.
Unfortunately, even with all of the positive things that took place over the last 12 months, there were a number of events that put a damper on the year.
Two past champions retired, a legend of the sport fell from grace and a famed trainer passed away.
The following is a recap of some of the saddest moments from 2011.