A 17-year-old has been indicted in the shooting deaths of his sister-in-law and her two sons, who were found in their home last year, the New Hampshire attorney general’s office said Wednesday.

Eric Sweeney was indicted by a Merrimack County grand jury in connection with the deaths of his sister-in-law, Kassandra Sweeney, 25, and his nephews, 4-year-old Benjamin Sweeney and 23-month-old Mason Sweeney.

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The three were found shot to death in their Northfield home Aug. 3, 2022. A possible motive for the shootings hasn't been made public.

Hampton Beach, Portsmouth, Manchester crime

17-year-old New Hampshire resident Eric Sweeney has been indicted in the shooting deaths of three relatives. (Fox News)

Eric Sweeney was also indicted on one count of falsifying physical evidence, alleging that he destroyed or concealed a handgun.

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Sweeney was arrested and charged as a juvenile last year. An arraignment was scheduled for Nov. 3.

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Court documents show that he is being represented by a county public defender's office but hasn't yet been assigned a specific attorney who could comment on his behalf.