The more investigators learn about Clark Rockefeller, who abducted his daughter during a supervised visit, the deeper the mystery surrounding him becomes. The mystery man accused of kidnapping his 7-year-old daughter is now facing questions about the disappearance of a California couple more than 20 years ago. The man who calls himself Clark Rockefeller was ordered held without bail at his arraignment in Boston Municipal Court after being returned to Massachusetts to face felony parental kidnapping and other charges. Los Angeles County authorities are sending two detectives to Boston to interview Rockefeller in connection with an unsolved disappearance of Jonathan and Linda Sohus, a San Marino (California) couple reported missing in 1985. Fingerprint evidence reportedly links Rockefeller to the cold case that is more than two decades old. A man named Christopher Chichester reportedly lived on the Sohus' property, and also disappeared. Defense attorney Stephen Hrones denied that his client had any connection to the California case. At this point, investigators can't even ascertain Rockefeller's true identity, as he's apparently gone by Clark Rockefeller, Clark Rock, Michael Brown, Christopher Chichester, and Charles “Chip” Smith. If he was ever issued a Social Security number, it's now unknown. Rockefeller claims that he doesn't even remember where he grew up or who raised him (Rockefeller has told friends his parents both died in a car accident.) Boston Assistant DA David Deakon told reporters that authorities have no idea who David Rockefeller really is. "He is a mystery man. He is a cipher."