A teen-age Jordanian Christian shot his 20-year-old sister to death in San Francisco because he was outraged that she had married a Muslim, police said. Lubna Zeidan, 20, was killed outside a friend’s house. Her 17-year-old brother reportedly told his father, Hikmat Zeidan, “I lost my mind.” Detectives said the boy used a .38-caliber revolver from his father’s liquor store. Friends said the young woman moved out of the family home and the city six months ago after arguing with the father over her plans to marry her Muslim boyfriend. The boy apparently learned of the marriage early this week when his sister returned to San Francisco for a visit.