BOSTON — A 24-year-old East Boston man has been arrested in Los Angeles in the Aug. 2 fatal shooting of a 21-year-old man on Meridian Street in East Boston, the Boston Police Department said Thursday.

Hamilton Mejia-Lainez was arrested by the U.S. Marshals in Los Angeles Wednesday, with help from the Boston department's Fugitive Unit, police said. He is expected to be arraigned on a murder charge in East Boston District Court, according to the department, which did not say when.

Officers from the District A-7 station in East Boston were called to a report of a person shot on Meridian Street at about 1:24 a.m. on Aug. 2, police said. They found Joseph Gabriel Lucas Gomez, 21, of East Boston, with gunshot wounds. He was taken to a hospital, where he died, according to police.

Police did not say what led to the shooting, how Mejia-Lainez was identified as a suspect or how he came to be in Los Angeles.

The charge is an allegation, and Mejia-Lainez is presumed innocent unless proven guilty in court.

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