Actor John Stamos was on the witness stand in Marquette today.
The actor is testifying in the case against Marquette residents Scott Sippola and Allison Coss.
They are accused of trying to extort nearly $700,000 from Stamos by threatening to sell supposedly compromising pictures of him.
Coss and Sippola were arrested in December during a sting.
They have pleaded not guilty to charges against them.
Stamos is best known for his starring role in the TV show Full House.
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