Defense lawyers for a former Blackwater private security guard who was once charged with manslaughter in Washington, D.C., are fighting the government’s assertion that he is still a defendant in the now-revived case.

Nicholas Slatten was one of five Blackwater guards charged with manslaughter in 2008 in Washington’s federal trial court following a shooting in Baghdad that left more than a dozen civilians dead. Lawyers for the guards, who were assigned to protect a U.S. State Department official, contend they acted in self-defense.