Deputy Scot Peterson, the school resource officer who didn’t enter the school

Deputy Scot Peterson’s inaction during the shooting brought widespread criticism and, this month, led to his arrest.

[Read more about Mr. Peterson’s arrest.]

Mr. Peterson, the only armed guard on campus, did “absolutely nothing to mitigate” the shooting, a report from the Florida Department of Law Enforcement said. For 48 minutes, it said, he stayed outside the building where students and others were shot.

Mr. Peterson was charged this month with seven counts of felony neglect of a child for what prosecutors said was his failure to protect the schoolchildren. They said the gunman killed six people and wounded four others while the deputy stayed outside. Mr. Peterson was also charged with culpable negligence and perjury. He had been suspended immediately after the shooting and resigned that same month.

[Read how Mr. Peterson, ridiculed as the “Coward of Broward,” has explained his actions.]

An affidavit filed in support of Mr. Peterson’s arrest said he also encouraged other officers to stay away from the building. One student told investigators that he saw Mr. Peterson standing around, “not really doing anything.”

Mr. Peterson has told a different story. He has denied being scared and has said he made the best decisions he could with the information he had at the time.

Sgt. Brian Miller, the first supervisor on the scene

Sgt. Brian Miller told investigators that he heard gunshots as he arrived on campus, but an investigation found that he did not begin using his radio to direct a response until five minutes after he arrived. He was fired earlier this month.

The sheriff’s office had put Mr. Miller on restricted duty during the internal investigation.

Scott Israel, the former sheriff replaced by the governor

Gov. Ron DeSantis replaced Scott Israel, the sheriff at the time of the shooting, earlier this year, making good on a campaign promise.