Bellator MMA President Scott Coker revealed last month that former Ultimate Fighting Championship (UFC) star Chris Leben had signed an exclusive deal to come out of retirement and resume his mixed martial arts (MMA) career with the promotion.
However, earlier this afternoon, Swedish website MMANytt.se reported that Leben recently underwent a physical, which revealed a serious medical problem: A damaged heart that can only pump blood at 18 percent capacity. To put that into perspective, Leben is at risk of suffering a heart attack after a light jog, ruling him out of a potential three-round MMA fight.