The comedy world just lost another great character actor this week as only a few days after the passing of Kenneth Mars, Len Lesser has died of cancer-related pneumonia at the age of 88. Lesser’s career in show business spanned more than sixty years and he has hundreds of credits to his name, but of course, he will always be best remembered for his role as Jerry’s obnoxious Uncle Leo on Seinfeld. Here are a few clips of some classic Uncle Leo moments. R.I.P. Len Lesser.