Charles Frederick Sharp III had called the police to his home in southwest New Jersey in the middle of the night to report trespassers in his backyard. One was carrying a gun, Mr. Sharp, who spent more than 20 years in the U.S. Air Force, told a 911 dispatcher.

Within five seconds of arrival, a police officer had fired multiple shots, fatally wounding Mr. Sharp as he stood outside his home in Mantua, N.J., in September 2021, according to state officials and footage from body cameras worn by police officers.

Mr. Sharp, 49, was still on the phone with the police when he was struck.

On Wednesday, the state’s attorney general announced that a grand jury voted this week to take the rare step of indicting the officer, Salvatore Oldrati, on manslaughter charges.

Thomas J. Eicher, executive director of the attorney general’s public integrity office, said Officer Oldrati gave Mr. Sharp no verbal commands or warnings before opening fire.

Mr Sharp died at the scene. Totally innocent. A victim of incompetence and stupidity. And the ready availability of fire power.