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Gov. Deval Patrick has named veteran prosecutor James Orenstein to serve as Hampden County District Attorney through the rest of the year.
Orenstein will take over for Mark Mastroianni, who stepped down as district attorney after his nomination to be a federal judge was confirmed. Mastroianni was sworn in Monday. He succeeds senior Judge Michael Ponsor, who is semi-retired.
Orenstein has worked in the Hampden DA's office for nearly 25 years. He's currently involved in special projects including pre-trial review of homicide cases, and cold case homicides.
Patrick said in a statement on Monday that Orenstein will maintain stability in the office until voters select a new district attorney in November. Four candidates are running for the post.
Mastroianni said Orenstein's work as a prosecutor has made Hampden County, which includes the city of Springfield, "stronger and safer."