Frank Potenza, the uncle of late-night talk show host Jimmy Kimmel, died early today; the details of his death were not made available. He was 77. A regular player on Kimmel's show, Potenza was known simply as "Uncle Frank," and was featured in such recurring sketches as "Guillermo's Hollywood Round-Up" and "Uncle Frank and Aunt Chippy's Adventures." Potenza, a Brooklynite, had been a New York City police officer for 20 years and worked private security for the likes of Frank Sinatra in Las Vegas before going to work for the Kimmel show in 2003 as a security guard. He was with the show for nine years. "Thank you for your kind words about a very kind man – my Uncle Frank – who passed away this morning," Kimmel tweeted today.