A former Florida A&M band member accused of being the ringleader of a brutal hazing ritual known as ''Crossing Bus C'' that killed a drum major was convicted Friday of manslaughter and felony hazing. Dante Martin, 27, was the first to stand trial in the November 2011 death of 26-year-old Robert Champion aboard a band bus parked outside a football game where the well-regarded Marching 100 band had performed.