Renowned MMA fighter Isaac Johnson has died at the age of 31. People Magazine has reported that the fighter collapsed during a bout in Chicago. He was in the third and final round against fighter Mario Aleksandrovski at the time when he sustained an injury. The incident took place at the Matador Fighter Challenge at Cicero Stadium on Friday, November 21. Emergency first responders arrived at the scene to transport “an injured fighter” to the hospital, a spokesperson for the town told NBC 5 Chicago. Isaac Johnson eventually died around midnight at the Loyola University Medical Center. As of this writing, an official cause of death has yet to be determined, as an autopsy has been scheduled. The circumstances surrounding Isaac Johnson's demise explored: Fox 32 Chicago has reported that, according to sources, Isaac Johnson was fighting his first Thai boxing match before he died. The Illinois Department of Financial and Professional Regulations is looking into the incident as he now leaves behind a wife and young daughter. Joe Goytia, promoter of the Matador Fighter Challenge, which is the event that the athlete was partaking in, told Fox 5 Washington, D.C. that ahead of the showdown, Johnson passed his mandatory physical exam. In a statement on Facebook, he wrote: "This is a post I hoped to never make , last night one of the fighters in our event Isaac Johnson collapsed towards end of his fight .Medical attention was given by medical staff on hand and he was transported to hospital . I was then informed at around 130 am this morning that he didn't make it . I don't have the words to express how I feel right now , all I can say is my deepest condolences to his family, friends, and teammates . We will know more as the medical report is released ." The Matador Fighting Challenge reportedly touted itself as "the ultimate MMA and Thai event, where local warriors will battle it out in high-stakes, high-intensity matches" on its website. In a statement, a spokesperson of the Illinois Department of Financial and Professional Regulations (IDFPR) told People Magazine: View this post on Instagram Instagram Post"The Illinois Department of Financial and Professional Regulation offers their sincere condolences to the family and loved ones of Mr. Johnson. The agency is aware of the events and will be thoroughly reviewing the circumstances surrounding Mr. Johnson’s passing after his amateur Muay Thai bout at Cicero Stadium." Stay tuned to SoapCentral for more.