Len Lesser, best known as the scene-stealing Uncle Leo on Seinfeld - "Jerry! Hello!" was his slogan - died from cancer-related pneumonia at a care facility in Burbank, Calif., it was announced Wednesday. He was 88. "Heaven got a great comedian and actor today," his daughter Michele said in a statement. Of Uncle Leo, Lesser told the Los Angeles Times in 1998: "He´s the kind of guy who is a total nuisance at times and the kind of guy you avoid. He´s a very expansive character, and that has an attraction to it."