I just pulled the following from Wikipedia, which includes a reference to the episode I saw this morning. I miss John.
Personal life (of John Ritter)
He married twice, once to actress Nancy Morgan (married 1977-divorced 1996) and then to actress Amy Yasbeck (married 1999-his death). Yasbeck had played his wife or love interest in the first two Problem Child movies (interestingly, she played a different character in each movie). Yasbeck also played Ritter's wife in two sitcom appearances. In 1991, both were guest stars on The Cosby Show, where Yasbeck played the in-labor wife of Ritter's basketball coach character. In 1996, Ritter guest starred on Yasbeck's sitcom Wings as the estranged husband of Yasbeck's character Casey. Ritter and Morgan had three children: Carly, Tyler, and Jason. He and Yasbeck had one daughter, Stella.