OIL CITY, Pa.—Police say a western Pennsylvania woman created a fake Facebook page on which she posed as her live-in boyfriend's estranged wife.

Online court records don't list an attorney for 29-year-old Jessica Kelly, of Titusville. She didn't immediately return a call for comment on charges of identity theft and harassment filed Monday by police in Oil City.

Police say Kelly used the fake Facebook page to "defame" the victim.

Police used a search warrant to obtain 100 pages of Facebook records, and say a computer address linked to the page belonged to Kelly's live-in boyfriend—the estranged husband of the woman Kelly allegedly impersonated and harassed on the social media website.

Police say the incidents happened from November through April.

Kelly faces a preliminary hearing Dec. 4.