Man found guilty of killing Secret Service officer during robbery, 15-year-old boy at Metro station

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A 19-year-old D.C. man was found guilty for killing an off-duty Secret Service officer and a 15-year-old boy at a Metro station in separate incidents during a four-month span.

A jury found Maurice Bellamy guilty on two counts of first-degree murder while armed, one count of armed robbery and a weapons offense.

Prosecutors say Bellamy murdered off-duty Secret Service officer Arthur Baldwin Jr. during a robbery on Dec. 15, 2015. Bellamy and two accomplices ambushed Baldwin while he was waiting for a friend in his car that was parked in the 4700 block of First Street in Southwest D.C. in the middle of the afternoon.

After shooting Baldwin, Bellamy and his two accomplices stole Baldwin's wallet, cellphone and iPad. Baldwin died at the hospital.

More than three months later, authorities say Bellamy killed 15-year-old Davonte Washington on the day before Easter on March 26, 2016 at the Deanwood Metro station.

The teenage victim was with his mother and two younger sisters waiting for a Metro train when prosecutors say Bellamy "mistakenly believed Davonte was 'mugging' on him." Because of this, Bellamy shot Washington twice in the chest at close range with a .38-caliber revolver. The killing was captured on Metro surveillance video.

According to the U.S. Attorney's Office for the District of Columbia, Washington was on his way to get his haircut for Easter. He was a ninth grade student at Largo High School.

Bellamy was arrested two days later. Investigators discovered that the same gun was used in both killings, officials say.

Bellamy is scheduled to be sentenced on July 20. He is facing life in prison without parole.