A 31-year-old man who is in custody in the killing of his former girlfriend has been charged with murder in a separate shooting, Prince George’s County police said Wednesday.

       Marcus Mitchell, of Landover, is being held at the county’s Department of Corrections. He is charged with first- and second-degree murder in the killing of Kenneth Reddix, 32, of Beltsville, police said. He was previously charged with murder in the killing of a woman with whom he was in a relationship, 29-year-old Remi Howell, police said.

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       On Jan. 28, officers responded about 2:40 p.m. to the 7000 block of Kent Town Drive in the Landover area and found Reddix outside with a gunshot wound. He died at a hospital.

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       According to an initial investigation, police said Wednesday, Mitchell and Reddix knew each other, and Mitchell shot Reddix during a dispute.

       Maryland man charged with murder in shooting of woman found by church parking lot, police said

       On Feb. 5, Howell was found shot near a church parking lot in the Landover area. Police announced that Mitchell was arrested and charged in Howell’s killing on Feb. 9.

       While he was in custody over Howell’s fatal shooting, a ballistic test revealed that the gun he is alleged to have used to kill her was also used to shoot Reddix, police said Wednesday.

       Police do not believe the two killings were related.

       Attorneys listed in online records for Mitchell could not be reached Wednesday.