Investigations are underway into an unsanctioned, staged wrestling event Sunday at Oklahoma City's Blue Note Lounge that resulted in a critical head injury to a 25-year-old Oklahoma City entertainer.

William Ogletree, a stand-up comedian and guitarist with the rock group The Hitt Boyz, was in critical condition Tuesday at the OU Medical center, a hospital spokesman said.

Ogletree was on life support equipment Tuesday afternoon but had no brain activity, said his uncle, Joseph Ogletree, a spokesman for the family.

William Ogletree reportedly was injured Sunday while participating in a maneuver called the "spine buster" during a staged wrestling event, his uncle said.