LOS ANGELES (AP) – A man accused of punching Dr. Dre at the Vibe Awards last year must stand trial on an assault charge, a judge ruled Friday. Superior Court Judge James Dabney found sufficient evidence to try 26-year-old Jimmy James Johnson, who allegedly punched Dre after asking for his autograph during a taping of the show on Nov. 15. The attack set off a chair-throwing brawl that spread through the crowd. Johnson, who has pleaded not guilty, was allegedly stabbed by rapper Young Buck after Dre was struck. Buck, whose given name is David Darnell Brown, has pleaded not guilty and is free on bail awaiting trial. Dre., the veteran producer and rap star, was about to receive a lifetime achievement award when he was punched. Dre, whose given name is Andre Young, is 40.