Odd way to commit suicide, in any event.
Eyewitnesses (I think some were ticket-takers) said he did. He wasn't caught on camera trying to enter--but then again, he wasn't caught on camera blowing himself up, either. Depending on the angle of the cameras, etc., they might have missed him.
Also note that they've beefed up security at not only college games, but highschool games too--and odd thing to do if this is just a "suicide."