Gunman who killed 12 died from self-inflicted gunshot

A bouquet of flowers, left by mourners, lays near the site of Wednesday's mass shooting, in Thousand Oaks, Calif., Friday, Nov. 9, 2018. Investigators

A bouquet of flowers, left by mourners, lays near the site of Wednesday's mass shooting, in Thousand Oaks, Calif., Friday, Nov. 9, 2018. Investigators

Ventura County Sheriff's Office Capt. Garo Kuredjian, left, embraces chaplains with the Billy Graham Rapid Response Team (RRT) as they pray near the s

Ventura County Sheriff's Office Capt. Garo Kuredjian, left, embraces chaplains with the Billy Graham Rapid Response Team (RRT) as they pray near the s

FBI investigators join law enforcement as they work near the scene of Wednesday's shooting in Thousand Oaks, Calif., Friday, Nov. 9, 2018. Investigato

FBI investigators join law enforcement as they work near the scene of Wednesday's shooting in Thousand Oaks, Calif., Friday, Nov. 9, 2018. Investigato

People gather outside the Rivalry Roasters coffee shop for a vigil for Sean Adler Thursday, Nov. 8, 2018, in Simi Valley, Calif. Adler was killed in W

People gather outside the Rivalry Roasters coffee shop for a vigil for Sean Adler Thursday, Nov. 8, 2018, in Simi Valley, Calif. Adler was killed in W

People gather to pray for the victims of the mass shooting during a candlelight vigil in Thousand Oaks , Calif., Thursday, Nov. 8, 2018. A gunman open

People gather to pray for the victims of the mass shooting during a candlelight vigil in Thousand Oaks , Calif., Thursday, Nov. 8, 2018. A gunman open

A picture of Noel Sparks is seen during a candlelight vigil in Thousand Oaks, Calif., Thursday, Nov. 8, 2018. A gunman opened fire Wednesday evening i

A picture of Noel Sparks is seen during a candlelight vigil in Thousand Oaks, Calif., Thursday, Nov. 8, 2018. A gunman opened fire Wednesday evening i

Thousand Oaks residents await to claim their vehicles as FBI agents verify vehicle registrations of autos parked in the lot of the Borderline Bar & Gr

Thousand Oaks residents await to claim their vehicles as FBI agents verify vehicle registrations of autos parked in the lot of the Borderline Bar & Gr

People hug as they arrive to recover their vehicles parked in the parking lot the Borderline Bar & Grill bar in Thousand Oaks, Calif., Friday, Nov. 9,

People hug as they arrive to recover their vehicles parked in the parking lot the Borderline Bar & Grill bar in Thousand Oaks, Calif., Friday, Nov. 9,

A flag is seen partially wrapped up in its pole due to heavy winds, outside the home of the ex-Marine Ian David Long, who killed 12 people at a countr

A flag is seen partially wrapped up in its pole due to heavy winds, outside the home of the ex-Marine Ian David Long, who killed 12 people at a countr

THOUSAND OAKS, Calif. (AP) — An autopsy has found the gunman who killed 12 at a Southern California bar died from a self-inflicted gunshot.

Police say Ian David Long, a 28-year-old ex-Marine machine-gunner, shot and killed 11 people at the Borderline Bar and Grill along with a police officer who responded just before midnight Wednesday.

Police said the officer exchanged gunfire with Long, who was found dead at the scene.

Ventura County Sheriff Bill Ayub said Saturday that an autopsy showed Long fatally shot himself.

Investigators say that based on time stamps, Long posted to Instagram during the attack. The post involved his mental state and whether people would believe here was sane.

Authorities have yet to determine a motive.