OXFORD, Maine (AP) — A Maine hunter charged with killing a woman he mistook for a deer has been formally charged with manslaughter.

An Oxford County grand jury returned the indictment against 38-year-old Robert Trundy, of Hebron. The Bangor Daily News reports that he'll be arraigned March 9. It wasn't immediately known if he had a lawyer.

The shooting happened Oct. 28, the first day of deer hunting season for Maine residents.

The 34-year-old victim, Karen Wrentzel, was digging for gemstones on her property when she was shot. In an affidavit, Trundy told game wardens he thought he was firing at a deer, and his attorney said that the shooting wasn't reckless.

Wardens say he fired from 200 feet (61 meters) away. If convicted of manslaughter, Trundy faces up to 30 years in prison.

(Information from: Bangor Daily News, http://www.bangordailynews.com)

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