An illegal immigrant tried to wrestle a Border Patrol agent’s gun away then was shot and killed by the agent’s partner, the agency said Thursday. Tucson Sector Chief Patrol Agent Rodolfo Karisch said the two agents were tracking a group of illegal immigrant suspects in southern Arizona and when they moved in to make an arrest, one of the migrants attacked, grabbing one agent’s gun. The other agent then shot the migrant, who died of the wound.