Frank Potenza and Jimmy Kimmel

Frank Potenza, who often appeared on his nephew's show Jimmy Kimmel Live!, died Tuesday morning, ABC announced. He was 77. A cause of death was not specified.

"His kindness and humor will be missed by everyone he touched," the show said in a statement Tuesday. "He was beloved by his co-workers and considered an Uncle to all." Kimmel also confirmed Potenza's passing on Twitter.

Potenza was a retired cop and Las Vegas casino security guard whom Kimmel invited to Los Angeles to join the late-night talk show. Thus, "Uncle Frank" was born. He was seen in a number of skits such as "Name That Oscar Winner" below:

Potenza is survived by three daughters and a granddaughter. He was married to Kimmel's Aunt Chippy for 28 years.