After police reviewed the surveillance video, Peterson was placed on unpaid leave.
The video above contains some of the sound of Peterson and other officers communicating during that response, coupled with the newly released video from the sheriff's office. "His actions were enough to warrant an internal affairs investigation, as requested by Sheriff Scott Israel on February 21", the sheriff's office said in a statement accompanying the CCTV footage. "Addressed the killer. Killed the killer".
A surveillance video released by the Broward Sheriff's Office shows Peterson and an unknown staffer walk up to the door around a minute after the shooting began. In it, Peterson can be seen receiving a call and running with other officers before standing still outside the school. According to a release by the sheriff's department last week, "training stresses the engagement of a suspect who is actively shooting to 1) eliminate the threat, 2) cause the suspect to barricade or 3) cause the suspect to surrender". When they arrive, Peterson pulls his weapon and goes forward but then retreats and takes up a position outside the building. He would be arrested on a nearby road at 3:50 p.m.
President Donald Trump called Peterson's lack of action "disgusting", but Peterson's lawyer said Israel "maligned" the deputy by saying he should have tried to engage the gunman. "That's a case where somebody was outside, they're trained, they didn't act properly or under pressure or they were a coward".
On March 24, a reported 500,000 people will come together on the streets of Washington, D.C.to demand the end of gun violence and mass school shootings.
"Let there be no mistake, Mr Peterson wishes that he could have prevented the untimely passing of the 17 victims on that day, and his heart goes out to the families of the victims", his attorney, Joseph DiRuzzo III, said in a statement.
"Sheriff Israel's statement is, at best, gross over-simplification of the events that transpired", the letter states, before listing 12 points outlining Peterson's version of events.
However, Peterson's attorney said his client at first believed the gunshots were fireworks when he heard them.