Former Navy SEAL who was shot and killed helped veterans with stress problems . Mayors Against Illegal Guns aired an ad during the Super Bowl advocating universal background checks for gun sales . Killing in Iraq raises new questions about mental health amid gun debate in Congress . Suspect , a civilian , told police last year he was suffering from post traumatic stress . Plans in Congress weigh expanding background checks , Obama calls for action on guns .
Former Navy SEAL who was shot and killed helped veterans with stress problems . Killing in Iraq raises new questions about mental health amid gun debate in Congress . Suspect , a civilian , told police last year he was suffering from post traumatic stress . Plans in Congress weigh expanding background checks , Obama calls for action on guns .