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A CHP officer tried to convince the man to get off the freeway but he refused and that led to a struggle, authorities said.

“During the struggle, the pedestrian was able to access a Taser he had in his possession, activated the weapon, and used the Taser against the officer,� the CHP said in a later statement. “Following the pedestrian’s use of the weapon against the officer, and in fear for his safety, the officer fired his service weapon."

The man was pronounced dead at a hospital.

The Los Angeles County medical examiner’s office confirmed the person died but did not provide identification, pending notification of family. A cause of death was not immediately released.

The highway patrol referred inquiries about the investigation to the California Department of Justice, which typically investigates fatal police shootings. The justice department confirmed it was investigating, but provided no additional details.

A minute-long video recorded by a bystander and posted on social media begins with an officer on top of another person as the two grapple in the middle of a closed stretch of freeway. It was not clear who took the original video.

As they struggle, a shot is fired and the officer suddenly jumps to his feet while the other man goes limp on the pavement. The officer immediately fires at least four shots at the prone man, the video shows. For the remainder of the clip, the officer keeps his gun drawn while the man lies motionless.

Ed Obayashi, a use-of-force expert who investigates police shootings for law enforcement agencies in California, cautioned against jumping to conclusions from the video alone.

Obayashi said investigators will want to know why the officer approached the pedestrian without a partner or other backup nearby. “They were able to close the freeway, so presumably there was law enforcement in the area,� he said.

Obayashi said the investigation will focus on whether the man was armed and why the officer felt the need to shoot after standing up and disengaging from the fight.

“Was there a knife? Or a stun gun?� Obayashi said investigators will ask. “We don’t know what kind of threat this officer perceived.�

Highway patrol officers aren't required to wear body cameras, but the agency uses in-car cameras.

State Sen. Steven Bradford, Assemblymember Mike A. Gipson and Councilmember Tim McOsker, who represent the area where the shooting occurred, released a joint statement calling for transparency by the highway patrol.

“The video of this shooting is deeply disturbing,� Bradford said. “This appears to be an unnecessary use of deadly force. The community deserves answers. If the roles were reversed, people would be immediately calling for murder charges. I call on the California Highway Patrol and the Department of Justice to be transparent and for the community to be calm and patient during the investigation.�