After an extensive cross-country road trip, John Patrick Bedell, 36, opened fire at the entry point of the Pentagon Thursday night, shooting two security officers.
Officers Marvin Carraway and Jeffrey Amos shot back at the gunman, killing him.
According to the shooter's family, Bedell suffered from mental illness long before the shooting Thursday. He was repeatedly a patient at mental health clinics.
"There's a history of mental health problems with him that the family's been dealing with for a number of years," San Benito County, California, Sheriff Curtis Hill said Friday.
Bedell suffered from bipolar disorder according to 2006 court records.
Bedell was also a heavy drug user.
"He was a heavy marijuana user and tended to self-medicate with marijuana. I don't know if he used other drugs," family friend San Benito County Supervisor Reb Monaco said.
Family described Bedell as their "beloved son, brother, grandson, nephew and cousin."
Bedell made a suspicious $600 purchase at a Sacramento shooting range, which he refused to discuss with his family. Once the purchase was made and Bedell took to the road, his father Oscar filed a missing persons complaint.
The complaint was closed when Bedell returned to his parents' Hollister home after a week of being missing.
Before the shooting, Bedell was reportedly "mumbling something," according to FBI Agent Lindsay Godwin.
Bedell parked his 1998 Toyota Avalon then opened fire at the Pentagon doors and was shot to death by security officers.