CBS News has learned investigators hired by Amazon CEO Jeff Bezos have now turned over their findings to law enforcement.
They are trying to find out how the National Enquirer obtained private photos and messages from Bezos, who claimed the tabloid was trying to blackmail him.
But a source close to Bezos' private investigators tells CBS News they have conducted multiple interviews with Michael Sanchez, the brother of Bezos' girlfriend.
CBS News law enforcement analyst Paul Viollis thinks someone Lauren Sanchez confided in was the likely leaker.
Elkan Abramowitz denied the explicit photos were part of blackmail plot.