One officer deployed a less lethal bean bag shotgun, striking Pigeon in the left hip, police reported. Sweeney discharged his firearm, striking Pigeon multiple times, according to police. The victim died at the scene.

Sgt. Sweeney fatally shot Dustin Pigeon, 29, early Nov. 15 after the victim called 911 threatening suicide, police reported. Officers responded to a house in southwest Oklahoma City and found Pigeon holding a bottle of lighter fluid and a lighter, threatening to set himself on fire, police reported.

Keith Patrick Sweeney, 32, is charged in Oklahoma County District Court. District Attorney David Prater filed the charge himself Tuesday morning.

An Oklahoma City police officer was charged Tuesday with second-degree murder, accused of unjustly shooting a suicidal person last month.

The investigation revealed Pigeon was unarmed and "not a threat to the officers when he was shot by Sgt. Sweeney," an officer wrote in a court affidavit. "After presenting the investigation to the Oklahoma County District Attorney's Office, it was determined the use of deadly force, by Sgt. Keith Sweeney, against Dustin Pigeon was not justified."

Sweeney was jailed Tuesday morning with his bail amount to be set by a judge, records show.

Prater plans to hold a news conference at 2:30 p.m. Tuesday. Body camera video of the incident will be released at that time.

Check NewsOK.com for updates on this developing story.