By now it is well known that Kosta Karageorge suffered from multiple concussions before his death, but it remains to be determined how severe his brain injuries were.

According to the Associated Press, Franklin County coroner Dr. Anahi Ortiz said a neuropathologist at Ohio State University (OSU) will conduct the brain examination. Police found the 22-year-old's body Sunday in a dumpster about a block from his apartment building, dead of an apparent self-inflicted gunshot wound.

Ortiz told the AP on Monday that the OSU football player and wrestler had a history of concussions and that she did not rule his death a suicide as of yet. Regardless, concussion research is progressing and it has revealed some troubling effects on the brain even after receiving treatment.

In the missing persons report, Karageorge's mother Susan said she received a text message from her son at 1:30 a.m. on Wednesday, about a half hour before he was last seen alive. In the message he said he was "sorry" for being "an embarrassment" and that "these concussions have my head all f---ed up."

"We know that many of you are concerned, as we are, about the tragic news that we received yesterday about the death of one of our student-athletes, Kosta Karageorge," OSU said in a statement, according to ESPN. "It is very early in the process of determining the cause of death, and the Columbus division of police is still investigating. We are unable to discuss this situation in detail at this time. The investigation continues, we are also not able to comment on student-athlete's medical treatments."

A senior at the school and a walk-on to the football team this season, Buckeyes head football coach Urban Meyer previously called Karageorge "a hard worker." The coach said in his weekly press conference Monday that he would not comment on the student's death.