(St. Paul, MN) -- Charges against the man accused of shooting Mahnomen County Deputy Chris Dewey have now been elevated to second-degree murder. Minnesota Attorney General Lori Swanson has filed amended charges against 33-year-old Thomas Fairbanks of Anoka, who was originally charged with attempted murder. Deputy Dewey died Monday morning, nearly a year-and-a-half after he was shot. Under Minnesota law, intentionally killing an on-duty police officer carries a charge of first-degree murder, but only a grand jury can make that charge. It's expected a grand jury will be called but there's no word yet from Mahnomen County prosecutors.