The tatted sex offender who was recently busted in New York for allegedly murdering an elderly man with a sword is now claiming to be behind a whole series of slayings across the country — dating back to when he was 12, officials said Wednesday.

The NYPD arrested 32 year old Nicholas Brent Gibson, also known as “Brent Savage,” on a Lower Manhattan subway platform Sunday for allegedly killing 77-year-old Eric Stocker in his Florida apartment.

After his arrest, Gibson claimed to have committed murders in Florida, California and Georgia going far back as 1999 — when he would have been around 12 years old, Miami police said.

“We are evaluating the information he has provided,” a statement from the Miami Beach Police Department said.

“We will be working with law enforcement in these locations in an attempt to determine the credibility of his statements.”

Gibson also admitted to his involvement in Stocker’s death, the department added.

Authorities believe Gibson had worked as a health aide to Stocker, whose body was found at least 10 days after he was killed with a sword in mid-April, sources told the Miami Herald

Gibson was convicted in Illinois for aggravated sexual assault in 2000 and spent the next seven years behind bars, according to the Miami Herald.

In 2008, he was locked up again for another four years for having sex with an underage girl, according to state prison officials.

A transit officer in the Big Apple spotted Gibson on the southbound L train platform at the First Avenue station at about 9:35 a.m. Sunday after recognizing him as a suspect in Stocker’s murder and cuffed him after a brief struggle.

Gibson was charged with resisting arrest, obstructing governmental administration and as a fugitive in another state, cops said.