Former New Orleans Saints lineman Charles Grant will NOT face criminal charges for viciously body slamming a student-athlete ... because both men were putting up a fight during the incident.
TMZ Sports posted the video of Grant crushing the student at Bowie State University ... where Grant was a part-time linebackers coach. University police investigated the October 30th incident ... and we've learned they determined it was a case of "mutual combat."
We obtained a copy of the incident report ... which states Grant -- who won a Super Bowl with the Saints -- refused to give police any statements about the body slam.
As we reported ... the university's already fired Grant -- but we're told he won't be rehired, even though he's been cleared criminally.