A Good Samaritan who has had “trouble with law enforcement in his life” dragged a wounded Texas cop to safety Saturday morning after he was shot in the leg during a firefight with a carjacker.

John Lally sprung into action when a shootout broke out after an unidentified 19-year-old suspect fled a traffic stop and crashed his stolen car on the Southwest Freeway in Houston at about 10 a.m., according to the Houston Police Department.