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    Fourth person arraigned in connection with fatal East Boston shooting

    A fourth person was arraigned Tuesday morning for his role in the Dec. 10 fatal shooting of 21-year-old Duncan Ketter, prosecutors said.

    Elijah Charles, 18, of Brockton, was arraigned in East Boston Municipal Court on charges of armed robbery and armed assault with intent to rob, according to a statement from the Suffolk County district attorney’s office.

    Charles was held on $200,000 bail, prosecutors said. He will next appear in court on Jan. 19.

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    Ketter was allegedly killed by Thorus O’Brien, also an 18-year-old Brockton man, when Ketter and a female acquaintance climbed into an SUV in East Boston to complete a sale of marijuana, the Globe reported at the time. The woman was also injured.

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    O’Brien was arraigned on Dec. 12 and held without bail on charges of murder, armed robbery, and unlawfully carrying a loaded firearm, prosecutors said.

    Twenty-year-old Demetrius Cast also faces armed robbery and other charges stemming from the incident. A 16-year-old also faces charges in the case.

    Alyssa Meyers can be reached at alyssa.meyers@globe.com. Follow her on Twitter @ameyers_.