Credit: Chris Unger/Zuffa LLCUFC flyweight contender Allan Nascimento’s tragic death rocked the Mixed Martial Arts world on Monday. Tragedy struck the Ultimate Fighting Championship on Monday as UFC flyweight contender Allan Nascimento was found unresponsive at his home after an apparent heart attack in his sleep. “This morning, Monday, August 3rd, our beloved flyweight fighter, Allan Nascimento, was found unresponsive after suffering an apparent heart attack in his sleep,” the UFC said of Nascimento. Allan Nascimento dies from heart attack just weeks after last UFC fightNascimento made his UFC debut in October 2021, losing an extremely tight split decision to Tagir Ulanbekov. Before signing with the UFC, Nascimento fought in promotions such as XFC and RIZIN.