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Attorney Mark Geragos is the unnamed co-conspirator referred to in the Southern District of New York's criminal complaint against Michael Avenatti, a source familiar confirms to CNN.

The complaint described the co-conspirator as "an attorney licensed in California who's known for his representation of celebrity and public figure clients."

Geragos has not been charged with a crime.

The Wall Street Journal was the first to report that Geragos was the unnamed co-conspirator.

Geragos did not immediately respond to CNN's request for comment.

Geragos, who has represented a number of high profile clients including Chris Brown and Jussie Smollett, was a CNN contributor.

Avenatti was arrested this morning outside of the offices of Boies Schiller Flexner LLP in Manhattan, according to a source.

A Nike lawyer, who cooperated with the investigation and is referred to as "Attorney-1" in in the charges, is Boies Schiller Flexner LLP partner Scott Wilson, according to a person familiar with the matter.