Blogged By: La Tray Source & Story Credit: Us Weekly Posted: Wednesday July 11, 2012 @6:50 p.m. PST   According to Us Weekly, Usher’s family friend Jeffrey S. Hubbard 38, is under investigation for the ski accident which left Usher’s 11-year old stepson brain dead.   Usher’s Family Friend Under Investigation Over Stepson’s Jet Ski…