19-year-old woman charged along with her husband in the murder of a man they met through Craigslist claims she has killed at least 22 others across the US.
In a jailhouse interview with the Daily Item in Sunbury, Pennsylvania, Miranda Barbour said she wants to plead guilty to killing Troy LaFerrara in November.
She also said she killed at least 22 other people from Alaska to North Carolina in the last six years as part of her involvement in a satanic cult.
When asked about the exact number of victims, Barbour said: "When I hit 22, I stopped counting."
She said she does not want to get out of jail and that she would kill again if she was released.
"I feel it is time to get all of this out. I don't care if people believe me. I just want to get it out," she told the newspaper.
Sunbury police Chief Steve Mazzeo told the Daily Item investigators have been in contact with the FBI and law enforcement in several other states.
He said: "From information we gathered and from information gathered from her interview we are seriously concerned and have been in contact with the proper authorities."
The FBI confirmed to Sky News that it was aiding in the investigation.
"The FBI's Philadelphia Division has recently been in contact with the Sunbury Police Department regarding Miranda Barbour, and will offer any assistance requested in the case," the agency said.
Attorneys for Barbour and her husband, 22-year-old Elytte Barbour, have not commented on the claims made in the interview.
The couple's lawyers have sought psychiatric evaluations for their clients.
Prosecutors are seeking the death penalty against Barbour and her husband.
Barbour told investigators she met Mr LaFerrara after he responded to her Craigslist advert offering companionship for money.
In court papers, police allege her husband told investigators they committed the crime because they wanted to kill someone together.
The couple told police Miranda Barbour stabbed Mr LaFerrara in the front seat of her car while her husband held a cord around his neck.
In her interview, Barbour offered little detail on the murders she claimed to have participated in in Alaska, Texas, North Carolina and California.
She claims she joined a satanic cult in Alaska when she was 13 before moving to North Carolina.
