Then-Broward County Sheriff's Deputy Scot Peterson, who was assigned to Marjory Stoneman Douglas High School during the February 14 shooting, is seen in this still image captured from the school surveillance video released by Broward County Sheriff's Office in Florida on Thursday.
Most of the recording above comes from one stationary camera on campus, and the sheriff's office released the video after being ordered to do so from a judge.
During the six-minute shooting, as Nikolas Cruz turned classrooms into deadly chaos, Peterson hardly moved, and he never entered the building. You can then see them pulling up to the corner of the building, along with blurred images of students.
Broward County Sheriff Scott Israel suspended Peterson last month after viewing the footage.
The former deputy has denied any wrongdoing during the incident, claiming that he only followed BSO training, establishing a "tactical position" because he believed the gunfire was coming from the outside of the building.
The video appears to show Peterson standing outside the building at the same time the shooting was taking place.
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He then quickly turns and jumps into a golf cart, along with a staff member, to investigate the gunshots at the 1200 building. In a statement issued through his lawyer shortly after his retirement, he said he thought the shots were being fired from outside the school.
"When it's an active shooter situation and you're hearing the shots being fired, you've got to assume that's what it is right off the bat", he said. The video above begins by showing students walking on campus, their faces blurred.
Broward County police and the Federal Bureau of Investigation were reportedly warned that the suspected shooter, 19-year-old Nikolas Cruz, could pose a threat prior to the shooting.
In the 27-minute video, Broward County Deputy Scot Peterson is seen outside the building while the massacre was unfolding inside, leaving 17 people dead. He has been charged with 17 counts of murder and 17 counts of attempted murder in the shooting.
A Florida judge earlier this week agreed with news outlets including The Associated Press that the video should be released. However, the sheriff's office warned that timestamps on the video and timestamps on the dispatch recording might not be "exactly synchronized".
"At any time Mr. Cruz is willing to enter a plea of guilty in exchange for a waiver of the death sentence", said Defense attorney Melisa McNeill.