Bearded, bald-headed and barrel chested, Kimbo Slice was an intimidating man to meet in a cage. But outside of the Octagon, the 6-foot-2, 230-pound brawler was known for his humble heart.

That heart failed Slice on Monday according to the South Florida Sun-Sentinal, which reported a day after the popular mixed martial artist died at the age of 42 that he was in need of a transplant.

“Slice, as Coral Springs-based fighter Kevin Ferguson was widely known, was admitted to Northwest Medical Center in Margate on June 3, complaining of severe abdominal pain, shortness of breath and nausea, according to information the hospital reported to Broward County’s medical examiner’s office,” The Sun-Sentinel reported.

“Slice was found to have a liver mass and congestive heart failure, and was placed on a ventilator in intensive care, according to the report.

“As Slice’s condition declined, doctors advised his family he would need a heart transplant, the report states.”

According to the report obtained by The Sun-Sentinel, illicit drug use, trauma or foul play did not impact Slice’s health. Doctors were preparing to transfer him to a facility in Cleveland, but it was too late for him to be moved and subsequently added the organ transplant list.

Slice had fought professionally as recently as February, when he knocked out Dada 5000 in the heavyweight match at Bellator 149. According to the Sun-Sentinel, post-fight tests found elevated testosterone levels and nandrolone, an anabolic steroid.