The Middlesex district attorney's office and Groton police say the victim was found dead in the home at about 5:30 p.m. Saturday.
A spokeswoman for the district attorney says a suspect who is known to the victim has been arrested and charged with assault and battery with a dangerous weapon.
No names were made public.
District Attorney Marian Ryan says more charges are possible.
Authorities say the death was "not a random incident" and there is no threat to the public.
Groton has a population of about 11,000 and is about 30 miles northwest of Boston.
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