Johnny Castaneda Jr., 25, of Richmond, a rapper who went by the stage names "Johnny Ca$h" and "Tha Fast Gunna," died Thursday from a gunshot wound to the head at John Muir Medical Center in Walnut Creek after being on life support, a Contra Costa coroner's official said Friday. Castaneda rapped on late Vallejo legend Andre "Mac Dre" Hicks' record label - Thizz Entertainment.Vallejo police said that Castaneda was shot multiple times in the parking lot of Sereno Village Apartments, 750 Sereno Drive. He was the second shooting victim found this year in the apartments, both with loose ties to Mac Dre's name.T.I.P. cutt