The video shows the off-duty Marine's SUV crashing through the gates of San Clemente High School with his two daughters in the back seat minutes before the deputy shot and killed him.
The dark and grainy video, released by the Capistrano Unified School District, doesn't show the shooting scene.
After crashing through the gate before dawn, investigators said 31-year-old Sgt. Manuel Loggins got out of the SUV and was acting irrationally before returning to the vehicle.
Investigators say Deputy Darren Sandberg, a 15-year veteran, feared for the girls' safety. Authorities said Sandberg shot and killed Loggins as he sat behind the wheel. Loggins' daughters, ages 9 and 14, witnessed the killing.
Authorities allege Loggins ignored Darren's commands.
"Because of the irrational behavior of Mr. Loggins, his failure to obey commands, the threat perceived by the deputy was for the safety of the children," said Jim Amormino of the Orange County Sheriff's Department.
Authorities said Loggins did not have a weapon.
Video shows two people wearing hoodies, possibly Loggins daughters, walking with deputies about 20 minutes after the incident started.
The Orange County District Attorney's Office continues to investigate, which is standard procedure after any deputy-involved shooting. They were examining the video.
"That's one of the many pieces of evidence that we're looking at," said Kang Schroeder of the D.A. "We're going to find out what happened that night and to see if an officer should be charged with a crime or not."
Loggins' family attorney said they plan to file a lawsuit against Orange County in about 10 days.