Based on what is known so far, Muhammad Youssef Abdulazeez was born in Kuwait and immigrated to the United States with his family as a young boy. He became an all-American boy in Chattanooga, Tenn. He grew up in a a somewhat strict Sunni Islamic family, but there don’t seem to have been any signs he was an extremist — at least not until he had already killed four U.S. Marines in a rampage gun attack on a recruitment station and a Navy Reserve center on Thursday.

We know now that Abdulazeez was an engineer, having graduated from a state college. He had wrestled in high school and loved mixed martial arts fighting. He had personal and family problems, and he suffered his first run-in with the law earlier this year, when he was cited for driving while intoxicated. He had recently traveled to the Middle East and visited Yemen.