Investigators in a New York case against a chauffeur who allegedly attempted to blackmail Yoko Ono are having to wade through pornography, a report says.

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The New York Daily News said thousands of pornographic videos have been found on 50-year-old driver Koral Karsan's computer, and investigators so far have been unable to find copies of an extortion letter he allegedly used to try to blackmail Ono.

Karsan had allegedly attempted to get $2 million from the widow of Beatles singer John Lennon by releasing intimate photos and phone calls to the public.

While prosecutors maintain that their case against Karsan remains strong despite the absence of the extortion letter, the driver's attorney claimed the pornography allegation is merely a way to smear his client.

"If the prosecution wants to engage in a battle of tarnishing reputations, there is no doubt that we will win that war. Ms. Ono's faults go far beyond the possession of pornography," Robert Gottlieb told the paper.