An Ohio State University football player who had been missing since Wednesday has been found dead in a dumpster from what appears to be a self-inflicted gunshot wound, Columbus police said Sunday.

Authorities said the body of defensive lineman Kosta Karageorge was found at East 6th Avenue and Courtland Avenue near the Ohio State campus. The senior defensive tackle from Columbus had last been seen at his apartment in Columbus, when his roommates said he left to go on a walk.

Karageorge's parents filed a missing-person report Wednesday evening, and his mother, Susan Karageorge, told police he has had several concussions and a few spells of being extremely confused, according to the report. She said that at about 1:30 a.m. Wednesday he texted a message that cited the concussions and said, "I am sorry if I am an embarrassment."

University athletic officials said they were grieved to learn of Karageorge's death.

A former Buckeyes wrestler, he joined the football team as a walk-on this season. He has played in one game and was among two dozen seniors slated to be recognized at the final home game Saturday against rival Michigan. The Buckeyes won, 42-28.

During halftime at the No. 16 Ohio State men's basketball game against James Madison in Columbus, pictures of Karageorge were shown and an announcement was made urging people with any information to contact police. Defensive lineman Michael Bennett said afterward that Karageorge missed practices and that teammates started getting nervous Thursday.

The team's physician, Dr. Jim Borchers, has said he could not comment on the medical care of student athletes.

The player's sister, Sophia Karageorge, told The Columbus Dispatch that he apparently was upset, and roommates said he went for a walk, dressed in black from his hat to his boots.

"We're very concerned that he's not himself and that he maybe doesn't know what's going on," she told the newspaper.

She said after each concussion he followed trainers' instructions and received proper care but "his repercussions from (concussions) have been long-term or delayed."

She said he was without his wallet and his motorcycle.

Coach Urban Meyer described Karageorge as a hard worker and an important player in practice.

The Associated Press contributed to this report.