Longtime MMA followers are mourning one of their early stars. Former UFC heavyweight champion Kevin “The Monster” Randleman has died.

He was 44.

Randleman’s family announced the sad news in a Facebook post:

“With saddened hearts, the Randleman family confirms the passing of Kevin ‘The Monster’ Randleman. Behind the name, was a gentle soul & loyal friend whom will be missed by many who loved him beyond the cage. The Ohio State University, UFC, MMA, & Sandusky, Ohio communities share in the loss of Kevin’s passing,” Randleman’s family said.

According to the post, Randleman died unexpectedly from complications of pneumonia.

“While traveling on business, Kevin became ill & un-exectedly passed due to complications from pneumonia. Kevin leaves behind a wife & four extraordinary children to share his legacy with the world who mourns his passing. Life without “The Monster” will never be the same.”

As Yahoo Sports points out, Randleman was not only know for his prowess in the ring but also for a series of unfortunate incidents including a very bad staph infection and a self-inflicted concussion prior to UFC 24.

Kevin Randleman's Family Releases Statement, Requests Privacy as They Mourn. https://t.co/R2qf3uBuJa pic.twitter.com/nykphsGrDp

— MMAWeekly.com (@MMAWeeklycom) February 12, 2016