The private military firm formerly known as Blackwater is facing another lawsuit over its work in Iraq. The family of a slain Iraqi security guard sued the company last week, saying a Blackwater contractor shot the man without provocation on Christmas Eve of 2006. At the time of the shooting, the Iraqi guard was on duty protecting Iraqi Vice President Adel Abdul Mahdi. According to the lawsuit, Blackwater promised to compensate the widow of the Iraqi guard in a series of payments but stopped after an initial payment of $20,000.