Vinod Khosla's daughter targeted in extortion plot by ex-boyfriend

She added that her family contacted law enforcement authorities soon after receiving threatening communications.

Tarlow and Nina Khosla, who met in 2007, dated for about two years before breaking up in late-2010.

The couple, who studied in Stanford's Product Design programme, started Lokho, a design firm for which Khosla registered a web site in mid-2009.

During their relationship, Khosla "voluntarily took nude photos and video," which she shared with Tarlow, according to Agent Solomon-Hill as cited by the Smoking Gun.

In September 2012, Nina and Neeru Khosla each received a series of texts from Tarlow's phone number. The messages included several naked photos of Nina Khosla taken during the period she dated Tarlow.

In subsequent communications, Tarlow allegedly sought $72,000, which he claimed the Khosla foundation owed him.

In the final e-mail cited by investigators, Tarlow allegedly wrote to Neeru Khosla on December 14.

He attached "a different nude picture" of her daughter, and asked, "Do you still want to buy these?'

The Smoking Gun said Tarlow did not respond to an e-mail sent to his Gmail account, nor to voicemail messages left on several phone numbers he has used.