Jerry Seinfeld's favorite Uncle that was always giving him a hard time, Len Lesser, passed away Wednesday night from complications of pneumonia. He will always be remembered for his performance on Seinfeld and Everybody Loves Raymond. We've got a classic clip from Seinfeld showing Uncle Leo at his best.

(CNN) -- Veteran actor Len Lesser died in his sleep Wednesday morning in Burbank, California, of complications from pneumonia. He was 88.

"It was very peaceful," his daughter, Michele Lesser, told CNN, saying the family had hoped for a quick and painless death. "He was a great grandpa, and an amazing father. He had a heart of gold -- and a sense of humor of platinum."

Best known as Jerry Seinfeld's Uncle Leo on TV's "Seinfeld," Lesser made more than 500 film, television and stage appearances. His TV roles ranged from "Studio One in Hollywood" in 1949 to a 2009 role on "Castle."

Full story at cnn.com