A well-known MMA fighter named Anthony "Rumble" Johnson, who had been suffering an unidentified disease, passed away at the age of 38.

Johnson's death was officially announced on Sunday by Bellator MMA, the fighting organization with which he most recently competed.

According to the advertisement, "The Bellator family is grieved by his untimely passing and we express our condolences to his family and friends during this terrible time."

Johnson twice competed for a UFC title, losing both times to Daniel Cormier, throughout the course of a 15-year MMA career during which he had a 23-6 record

These contests, which took place between 2015 and 2017, were at the light heavyweight division, where Johnson eventually shifted after beginning in the welterweight division.

Johnson's hitting prowess is demonstrated by the fact that 17 of his victories were knockouts.

Anthony Johnson was a compassionate individual, according to the now-retired Cormier, who wrote in a tweet about him.

"Check-ins during losses to random texts. Rumble was a wonderful person, and we will miss him. Life doesn't always seem fair.

Johnson posted about his sickness on social media the previous year.

Johnson posted on Instagram, "Really wish I could go into depth about how ill I genuinely feel.