BOSTON -- A fingerprint is the latest clue investigators are pursuing as they work to unravel the identity of the man calling himself Clark Rockefeller.

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As California homicide detectives arrived in Boston Wednesday to question him about the 1994 discovery of human remains in a California swimming pool excavation, a police officer said Rockefeller has the same fingerprints as the man who once called himself Christopher Chichester.

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“There are similarities between Clark Rockefeller's description and the description of Chichester," Frank Wills told the Pasadena Star News. "They have the same fingerprint."

Wills was the police chief in San Marino, Calif., when a newlywed couple disappeared. He is now the police chief in West Covina, Calif.

The Los Angeles County Sheriff's Department said Tuesday night they now consider Rockefeller "a person of interest in the case."

An undated picture of the man calling himself Chichester published on the Web site of the Pasadena Star News showed a man the sheriff's department said could be Rockefeller.

“The resemblance is certainly there and that is going to be folded into the investigation,” said Steve Whitmore, of the L.A. County Sheriff's Department.

Workers digging a swimming pool in the back yard of a home found the remains in May 1994. Officials said the victim may have been Jonathan Sohus. In 1985, he disappeared with his wife, Linda, before they were scheduled to travel to Europe for a honeymoon.

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Chichester was living as a tenant in the couple's house at the time of their disappearance, officials said. At the time, he was sought in connection with the case.

Chichester was a “con man who often surfaces in affluent neighborhoods and mingles in social circles by making friends with wealthy influential people. He often volunteers for good causes like raising money for charity," a sheriff's press release said at the time.

Police at the time said Chichester claimed to be the son of British aristocrats and was using several aliases including Christopher Crowe, Chris Chichester, Christopher Crowe Mount Batten. He was described as 5 feet 8 inches tall, 150 to 160 pounds with a slight frame, fair and thinning hair.

At his arraignment on charges of kidnapping his daughter Reigh Boss in Boston Tuesday, prosecutor David Deakin said they have no idea who Rockefeller really is.

"From the time of the abduction to today, special agents from the FBI as well as Boston police detectives have worked around the clock trying to figure out who Rockefeller is," Deakin said. "It's been roughly nine days since they started this process and before 1993 we are no closer to knowing who this defendant is. He has used various aliases."

Rockefeller’s attorney Stephen Hrones told reporters that his client said allegations he was involved in the California case were “garbage and completely untrue.”

“I would not allow him to talk to the police, whether he is innocent or guilty. Any lawyer would not allow his client to talk to police,” Hrones said.

Rockefeller, who has used several aliases over the years, does not appear to have a previous work history, Social Security number or driver's license. During hours of interrogation, he refused to give police any information about his identity, answering most questions by saying he doesn't remember, a police official said.

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Chichester was reportedly last seen in 1989 in Greenwich, Conn., the Pasadena newspaper reported. He was stopped by police there driving a vehicle registered to John Sohus.

ABC News' "Good Morning America" reported Wednesday that California authorities said a man who once applied for a driver's license there under the Chichester name used as identification a passport with the name Christian Gerhard Streider, a German citizen.