Kimbo Slice, the mixed martial arts star who died Monday at age 42, had been diagnosed with heart failure and advised he would need a transplant.Mr. Slice, as Kevin Ferguson was widely known, was admitted to Northwest Medical Center in Margate on Friday, complaining of severe abdominal pain, shortness of breath and nausea, according to information the hospital reported to Broward County's medical examiner's office.Mr. Slice had a liver mass and congestive heart failure, and was placed on a ventilator in intensive care, according to the report.He died at 7:30 p.m. on Monday as doctors were preparing him for transfer to a facility in Cleveland, where he could have been placed on an organ donor list.The report stated Slice had no history of illicit drug use, and trauma and foul play were not suspected in his death.Calls to his family were not returned.Mr. Slice was scheduled to headline the Bellator 158 fight card in London next month against James Thompson.Mr. Slice became a viral sensation in the early 2000s for his street-fighting clips on YouTube. Raised in the Miami area, Slice was a strip club bouncer and bodyguard before his MMA career began to take off.For the past seven years, Mr. Slice trained at American Top Team, where his death hit the Coconut Creek gym hard."This is like losing a brother," ATT coach and co-founder Marcus "Conan" Silveira said.Recently married, Mr. Slice is survived by his wife and six children. "We are all shocked and saddened by the devastating and untimely loss of Kimbo Slice, a beloved member of the Bellator family," Bellator president Scott Coker said in a statement.