He (https://en.wikipedia.org/wiki/John_Calvin_(actor)) seems to have retired (https://quantumleap.fandom.com/wiki/John_Calvin) in 1995. He's 75 now (https://cscottrollins.blogspot.com/2021/11/happy-birthday-john-calvin-tall.html). He made (https://www.imdb.com/name/nm0130890/) a lot of TV movies and guested in quite a few series.