On June 20, 1994, Dr. Thomas Erwin Brigham, a 31-year-old Air Force major and psychiatrist, was shot and killed in his office at the Fairchild Air Force Base hospital annex in Washington. A former patient, 20-year-old Dean A. Mellberg, arrived carrying a duffel bag that contained a Chinese-made MAK-90 semi-automatic rifle with a 75-round drum magazine. Mellberg, who had been discharged the previous month from the Air Force for psychological issues and blamed Brigham and Captain Alan W. London for his discharge, opened fire in the shared office and killed both Brigham and Captain London.

Mellberg continued through the hospital and into the parking lot, shooting randomly. Two other people were killed — an 8-year-old girl and a 39-year-old service member’s wife — and 22 others were wounded. Military police Senior Airman Andy Brown confronted Mellberg in the parking lot and shot and killed him at the scene. Anyone with information about Dr. Brigham, his work at the base hospital, or that day’s events is asked to come forward.