ESPN is reporting that Shaquille O'Neal is under investigation by the Atlanta Police Department.
At issue is an incident last May in which O'Neal allegedly injured a co-worker at Turner Studios, where O'Neal works as an NBA analyst.
Robert Williams says he was tackled by O'Neal, hurting his neck and back, requiring surgery.
No charges have been filed as yet. The incident is said to have taken place on May 9 but wasn't reported to police until July 2.
O'Neal's attorney says the incident was "horseplay." However, the attorney for Williams says it was not horseplay.
O'Neal retired as a player in 2011, and is part owner of the Sacramento Kings.