TMZ has learned Wiz Khalifa’ s concert near San Jose, CA Friday night turned deadly … when a man was shot to death. The concert was at the Shoreline Amphitheatre in Mountain View, CA. Just after 11 last night … shot’s rang out as Wiz was performed. One source tells TMZ … the victim was shot backstage and was hit at least 5 times. Cops are investigating and looking for witnesses.