MMA heavyweight Justin Eilers was found dead Christmas night in Nampa, ID, with a .45 bullet in his chest.
Eilers' mother's boyfriend, James Malec, was taken into custody in what police are calling a "domestic disturbance". Second-degree murder charges have been filed.
Eilers, who bounced between UFC, EliteXC, and other MMA organizations in his six-year professional fighting career, fought last for the now-mostly-defunct EliteXC in July, losing his shot at the EliteXC heavyweight title. He also played football for Iowa State in 2000-2001 with Sage Rosenfels.
This follows the violent death of Justin Levens last week and Evan Tanner's disappearance and subsequent hyperthermia death in September.