BANGOR, Maine (AP) – Court documents say a Bangor, Maine, man charged with murdering a 19-year-old woman confessed to killing her.

An affidavit written by Police Detective Brent Bealieu says 34-year-old Colin Koehler stabbed Holly Boutilier in the abdomen with a curved Japanese sword before slitting her throat in front of a 27-year-old male witness.

The Aug. 12 affidavit was unsealed Monday after the Bangor Daily News filed a Freedom of Information Act request.

Boutilier was found dead Aug. 9 in a makeshift shack along the Penobscot River.

The affidavit does not explain how Koehler and Boutilier knew each other or give any details about their relationship.

Koehler is being held without bail at the Penobscot County Jail. He is expected to be indicted later this month.