Usher's Stepson's Accident Being Investigated

As TMZ first reported, the 11-year-old was struck in the head by a jet ski while riding in an inner tube on Lake Lanier. He was rushed to a nearby hospital and remains there in critical condition.

Robin Hill, a rep for the Department of Natural Resources (Wildlife Resources Division), tells TMZ the department's Critical Incident Response Team will recreate the accident on the lake to help determine what happened. Using special computer programs, they will attempt to figure out how fast the boats were going at the time of the accident.