Suspect arrested in 2017 Baltimore killing of off-duty DC officer, sources say – NBC4 Washington

Prosecutors announced an arrest in the shooting death of an off-duty D.C. officer in Baltimore in 2017.

Sgt. Tony Mason Jr. died after he was shot in west Baltimore in November 2017, more than six years ago. The 40-year-old had worked for the Metropolitan Police Department for 17 years.

Dion Thompson was charged with first-degree murder, conspiracy and related charges, Baltimore State’s Attorney Ivan Bates said at a news conference Wednesday.

A cold case unit investigated the case, and a community tipster provided crucial information, officials said.

“For far too long, the details surrounding Sergeant Mason’s tragic death have remained a painful mystery. However, the Baltimore Police Department, the FBI, the ATF, and the Baltimore City State’s Attorney’s office never stopped following up on tips and tracking down leads,” D.C. Chief of Police Pamela Smith said.

A Baltimore official declined to comment on whether Mason was targeted because he was an officer.

Mason was sitting in a parked car in the 2800 block of Elgin Avenue with a woman when someone approached the car and opened fire, police said. Mason and the woman were both taken to a hospital, where Mason died of his injuries.

Mason was a sergeant in the D.C. police department’s Sixth District, police said after his death. He was on non-contact status because of an “internal investigation,” a police spokesman said.

Mason was a tough, diligent officer, a former colleague said.

“He was just the nicest guy – always happy to see you and greeted you with a smile,” David Simonetti said. “He’d do anything for you, without having to be asked.”

Baltimore police, the FBI and the U.S. Bureau of Alcohol, Firearms, and Tobacco collaborated on the investigation.

It wasn’t immediately clear if Thompson has a lawyer.

Anyone with potentially relevant information is asked to contact Baltimore police.

Stay with NBC Washington for more details on this developing story.

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