Scot Peterson, who served as a Broward County sheriff’s deputy and school security officer, was found not guilty of child neglect and culpable negligence charges.
Peterson, 60, faced over 96 years in prison if convicted on the charges, reports noted.
In February 2018, a gunman killed 17 students, teachers, and staff at the school, injuring 17 others as well.
Florida prosecutors charged Peterson for refusing to investigate the source of the gunfire and retreating during the shooting. Peterson was said to be the only other person at the school in possession of a firearm when the shooting began.
A 33-year law enforcement veteran, Peterson claimed that chaos, miscommunication and a mistaken assumption the shots were being fired by a sniper outside the building kept him from confronting the shooter.
Nikolas Cruz, a former student at the school, pleaded guilty to charges linked to the shooting, for which he was sentenced to life in prison without the possibility of parole.