Salman Taseer, governor of Punjab province, is shot and killed in Islamabad. Police say the gunman, one of Taseer's guards, killed the outspoken official because of his opposition to Pakistan's blasphemy laws.The governor of Pakistan's most populous province was gunned down in an upscale Islamabad marketplace Tuesday, apparently by one of his own guards, a brazen killing that threw a country already roiled by political crisis into even greater turmoil.