The man who calls himself Clark Rockefeller has constantly rejected any accusations regarding his alias-filled past by blaming his flawed memory. Furthermore, he said he didn’t remember any connection between him and a Southern California couple who disappeared more than two decades ago.

However, more than a week after being charged with abducting his own daughter from Boston, Clark Rockefeller confessed that he has been using aliases and that he knew the couple who vanished in 1985, The Associated Press reported.

Although the man’s lawyer said his client remembered only fragments of the life he led before 1993, officials said they have deciphered a great part of the man’s mysterious past and have named him a “person of interest” in the newlyweds’ enigmatic disappearance, according to the same source.

Los Angeles County sheriff’s investigators announced on Monday that Clark Rockefeller’s real name was Christian Gerhartsreiter, a German native who has made use of numerous aliases since he arrived in the United States more than 20 years ago. Moreover, spokesman Steve Whitmore informed The Associated Press that homicide detectives have established Gerhartsreiter’s identity after talking to people who had men him many years ago.

The police are also investigating Christian Gerhartsreiter, who is held in custody in Boston on kidnapping charges, for the disappearance of the Southern California couple, Jonathan and Linda Sohus. Using the name of Chichester, the man rented a house on a property in San Marino owned by Jonathan Sohus’ mother, investigators said, cited by the AP. Skeletal remains were uncovered at the Sohus property in 1994 when the new owners were building a swimming pool.

The district attorney’s office and FBI in Boston said on Monday they were not prepared to proclaim that Rockefeller and Gerhartsreiter were the same person, according to the same source.