A California man who ran celebrity memorabilia stores admitted on Monday that he made as much as $550,000 over a decade by selling fans hundreds of fake items, including supposed autographs of Kobe Bryant, Kim Kardashian and President Donald Trump, the Justice Department announced.

Anthony J. Tremayne pleaded guilty in federal court to forging the items and hundreds of other collectibles that were purportedly signed by iconic movie stars, musicians and athletes. Among them were the forged signatures of Muhammed Ali and the Beatles on a single photo and Twilight Saga stars Robert Pattinson, Kristen Stewart and Taylor Lautner on a poster.

Tremayne’s guilty plea in the Central District of California marks a final point in the charade the former San Gabriel Valley resident carried on for nearly 10 years through his businesses, including Timeless Treasures.

“Relying on Tremayne’s statements that the signatures were genuine, customers sent Tremayne money to purchase the memorabilia and have it mailed to them,” the U.S. Attorney’s Office said in a statement, adding he sometimes included certificates of authenticity. “In fact, Tremayne forged the signatures, and the authenticity certificates were bogus.”

The case comes as demand for collectibles continues to escalate and the trade for sports memorabilia alone grows into a $30 billion market. U.S. Postal Service inspectors have attempted to root out such cases of fraud for decades but con men continue preying on fans seeking a piece of a favorite icon at a minor-league price.