Image: 'Clark Rockefeller'
Mike Adaskaveg  /  Pool via AP
Christian Karl Gerhartsreiter, who calls himself Clark Rockefeller, is arraigned on kidnapping charges last Sept. 29 in Boston, Mass.
updated 1/22/2009 12:56:56 PM ET 2009-01-22T17:56:56

A lawyer for the man who calls himself Clark Rockefeller said Thursday that discussions are under way for a possible guilty plea to at least one charge against him in the kidnapping of his 7-year-old daughter.

Defense attorney Jeffrey Denner told The Associated Press the defense and prosecution would go before a judge Thursday to conduct plea negotiations.

Denner said the two sides are "exploring all options," including a guilty plea or trial.

Rockefeller is charged with parental kidnapping, assault and battery, assault and battery with a dangerous weapon and giving a false name to police.

He allegedly took his daughter during a supervised visit in Boston in July, then fled with her to Baltimore. The girl was found unharmed.

After his arrest in Baltimore in August, he was identified as Christian Karl Gerhartsreiter, a German national who lived under various aliases after arriving in the United States in 1978.

Tied to 1985 disappearances
The Los Angeles County Sheriff's Office has labeled Gerhartsreiter a "person of interest" in the 1985 disappearance of Jonathan and Linda Sohus. Gerhartsreiter, who at the time called himself Christopher Chichester, rented a guesthouse at the home of Jonathan Sohus' mother in San Marino, a wealthy Los Angeles suburb.

Gerhartsreiter has denied any involvement in the couple's disappearance.

After Gerhartsreiter's arrest, Los Angeles authorities filed an affidavit along with Boston police seeking a search warrant for his computer hard drives.

Nine years after the couple disappeared, workers building a pool for the new owners of the San Marino home unearthed a man's bones that remain unidentified. Investigators did new DNA testing on the bones after Gerhartsreiter's arrest but have not released details.

More on 'Clark Rockefeller'

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Photos: The man who would be Rockefeller

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  1. Father and daughter

    The man who called himself "Clark Rockefeller" but whom police have identified as Christian Karl Gerhartsreiter is pictured here with his daughter, Reigh Boss, in an undated photo provided by the FBI. Gerhartsreiter became the object of an international manhunt in July 2008 when he allegedly abducted Reigh from his ex-wife during a custodial visit. (AP) Back to slideshow navigation
  2. Helping in the hunt

    Julie Gochar, managing partner of Obsidian Reality, spoke to reporters in Baltimore about her firm's role in helping authorities find Gerhartsreiter. The man known as Clark Rockefeller had contacted Obsidian about buying a home in Baltimore, where he apparently planned to start a new life with his daughter under the assumed name "Chip Smith." (Steve Ruark / AP) Back to slideshow navigation
  3. The 'Rockefeller' boat

    A "concerned citizen" tipped off authorities that the man known as Clark Rockefeller was living in a Baltimore apartment and had a 26-foot catamaran docked at a nearby marina. Police lured "Rockefeller" out his apartment by calling him and telling him that the boat was taking on water. (AP) Back to slideshow navigation
  4. YouTube plea

    Sandra Boss, ex-wife of the man who called himself Clark Rockefeller, appeared on YouTube to plead for him to return their daughter Reigh to her safely after he allegedly kidnapped the girl during a supervised July visit in Boston. (Boston Police Department via AP) Back to slideshow navigation
  5. Facing justice in Baltimore

    The man who called himself Clark Rockefeller appeared before a Baltimore District Court judge, where he waived his right to extradition. (Court Room Sketch by Art Lien via Getty Images) Back to slideshow navigation
  6. Multiple identities

    This image provided by the Los Angeles County Sheriff's Department shows a wanted poster of the suspect variously known as “Clark Rockefeller,” “Chris Chichester,” and what authorities say is his real name, Christian Karl Gerhartsreiter. The poster asks for information regarding the 1985 disappearance of John and Linda Sohus, of whom Gerhartsreiter had been a tenant. (AP) Back to slideshow navigation
  7. The couple who vanished

    This undated image shows Jonathan and Linda Sohus, in whose San Marino, Calif. guesthouse the man now identified as Christian Karl Gerhartsreiter had been a tenant. The couple disappeared in 1985. Authorities believe an skeleton unearthed in 1994 to be the remains of Jonathan Sohus; Linda has never been found. (AP) Back to slideshow navigation
  8. Jailhouse interview

    In August 2008 Christian Karl Gerhartsreiter spoke with NBC News’ Natalie Morales during an exclusive jailhouse interview in which he gave a cryptic account of his life, claiming not to remember much of it. The man who called himself “Clark Rockefeller” refused to definitively deny that he is related to the famed Rockefeller family. (TODAY) Back to slideshow navigation
  9. Ex-wife takes the stand

    During Gerhartsreiter's kidnapping trial at Suffolk Superior Court in Boston, June 1, 2009, Sandra Boss was asked to produce her daughter's birth certificate. She described her ex-husband, who is facing charges for kidnapping his daughter, as attractive and charming when she met him. But, she said, things changed for the worse when they married. (Lisa Poole / Pool via AP) Back to slideshow navigation
  10. The trial begins

    Christian Karl Gerhartsreiter, who calls himself Clark Rockefeller, enters court for his kidnapping trial at Suffolk Superior Court in Boston June 1, 2009. Gerhartsreiter, originally from Germany, is charged with kidnapping his 7-year-old daughter. (Lisa Poole / Pool via Reuters) Back to slideshow navigation
  11. Judgment day

    Christian Karl Gerhartsreiter, also known Clark Rockefeller, listens to the verdict in his kidnapping trial in Suffolk Superior Court in Boston on June 12, 2009. Rockefeller, whom the FBI and prosecutors have identified as Gerhartsreiter, was found guilty of kidnapping his 7-year-old daughter and of one of two charges of assault on a social worker. (CJ Gunther / EPA) Back to slideshow navigation
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