A man fired multiple shots from a handgun in Bush Intercontinental Airport on Thursday before committing suicide. No one but the shooter was injured.

Houston’s KHOU news is reporting that the man was 29-year-old Carnell Moore from Beaumont, Texas. The TV news station also reported that Moore left behind a suicide note stating he had a “monster within” and coloring the shooting as a suicide-by-cop situation.

Over the course of the week, Moore had posted cryptic messages to his Facebook account about “staring death in the face” and stating, “This Life Will Crash Tomorrow!”

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Witnesses to the shooting told KHOU that Moore simply walked into terminal B at the airport and began firing his weapon. A U.S. Homeland Security agent is reported to have fired on Moore as the shooter fired a gun at himself. An autopsy will be performed to determine which bullet ended Moore’s life.