More than two decades after John Ritter’s sudden death, his wife and child are still shattered by the loss, RadarOnline.com can reveal. The Three’s Company star was 54 years old when he suffered a fatal heart episode on the set of his sitcom 8 Simple Rules in September 2003. While his older children with first wife Nancy Morgan – Jason, 44, Carly, 42, and Tyler, 39 – have moved on with their lives and careers in entertainment, according to family and friends, his second wife, Amy Yasbeck, 61, and his transgender son, Noah, 25, have had more difficulty. A source shared: “His death affected Amy …