Authorities said Miranda Barbour told investigators she met the victim after he responded to her Craigslist ad offering companionship for money. Ken James/Bloomberg/Getty Images

A Pennsylvania woman charged along with her newlywed husband in the murder of a man they met through Craigslist admitted to the slaying in a jailhouse interview with a newspaper, and said she has killed more than 20 other people across the country. Police said they are investigating her claims.

In an interview with the Daily Item in Sunbury, Pa., 19-year-old Miranda Barbour said she wants to plead guilty to killing Troy LaFerrara in November. She also said in the interview that she has killed at least 22 other people from Alaska to North Carolina in the past six years as part of her involvement in a satanic cult.

“When I hit 22, I stopped counting,” Barbour told the newspaper for a story published Saturday night.

Sunbury police Chief Steve Mazzeo told the newspaper that investigators have been in contact with the FBI and law enforcement in several other states.

"From information we gathered and from information gathered from her interview we are seriously concerned and have been in contact with the proper authorities," Mazzeo said.

Lawyers for the couple did not immediately return messages from The Associated Press left at their offices Saturday night. An FBI spokesman referred questions to its Philadelphia office, but an email message was not immediately returned.

Prosecutors are seeking the death penalty against the woman and her husband, 22-year-old Elytte Barbour. Authorities said Miranda Barbour, a petite woman with long brown hair, told investigators she met the 6-foot-2-inch, 278-pound victim after he responded to her Craigslist ad offering companionship for money.

In recent years, numerous reports have surfaced of murders occurring after the assailant and victim met as total strangers to exchange goods or services through online social networking platforms like Craigslist, or exclusively for romantic encounters on platforms like Grindr.

Police allege in court papers that Elytte Barbour told investigators they committed the crime because they wanted to kill someone together.

The couple, who were married in North Carolina and moved to Pennsylvania about three weeks before the crime, told police that Miranda Barbour stabbed LaFerrara in the front seat of her car while her husband held a cord around his neck.

She said in the interview that she does not want to get out of jail and that she would kill again if she were released.

Miranda Barbour offered few details about the murders in which she claimed to have participated in Alaska, Texas, North Carolina and California. She said she joined a satanic cult in Alaska when she was 13, before moving to North Carolina. Online records for the woman that the newspaper identified as Barbour's mother show her as having lived in both Alaska and North Carolina.

Last week, a judge granted a lawyer's request to have a forensic psychiatrist evaluate Miranda Barbour. The judge had earlier approved a psychiatrist to evaluate Elytte Barbour.

Al Jazeera and The Associated Press