“Yeah. I adored this man,” tweeted Jason Alexander, who spent years working alongside Jerry Stiller on Seinfeld, playing his son George. Jason was the first of the cast members of Seinfeld to reveal his sorrow over the passing of Stiller, who died on May 10 of natural causes. While his death was confirmed by his real life son, Ben Stiller, his TV son wasted no time in remembering the man behind Frank Constanza for all the love and laughter he brought into the world.