The security guard who shot and killed his supervisor on Northrop Grumman’s Linthicum manufacturing campus pleaded guilty to murder Thursday, the Anne Arundel County state’s attorney’s office said.

After a work-related discussion went poorly on Jan. 28, Dylan Blake Chandler, 27, pulled out a gun and shot Joseph Keith Aman, 37, in the head, police have said. Aman, a Baltimore resident, was pronounced dead at the scene. Chandler was disarmed and restrained by his co-workers, then arrested after Anne Arundel County Police arrived.

Chandler pleaded guilty to second-degree murder and use of a firearm in a crime of violence in Anne Arundel Circuit Court, the state’s attorney’s office said in a news release.

Associate Circuit Judge Cathleen Vitale scheduled the Pasadena man’s sentencing for Dec. 15.

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“Investigators believe the defendant did not premeditate or plan to commit murder, but rather killed the victim following being reprimanded for workplace conduct,” Anne Arundel State’s Attorney Anne Colt Leitess said in a statement. “This is a horrible tragedy. My heart goes out to the family of Mr. Aman, who have suffered a devastating loss due to this defendant’s irrational actions.”

Northrop Grumman makes radar and other defense-related systems on the campus along Aviation Boulevard next to Baltimore-Washington International Thurgood Marshall Airport.

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Security guard at Northrop Grumman fatally shot co-worker during performance review, police say

Chandler worked as an armed security guard for a contractor at the facility. He’d been called to Aman’s office to discuss workplace performance issues. According to the state’s attorney’s news release, a witness heard the two talking before a loud boom. When the witness turned, Chandler was pointing his firearm at a wounded Aman.

In an interview with Anne Arundel homicide detectives, Chandler admitted he “snapped” and shot the victim once in the head, the release said.

Assistant State’s Attorney April Skrenczuk prosecuted the case.