That covers the main cast of "The Dick Van Dyke Show," but there's actually one more performer from the show who's still with us. Peter Oliphant, who played neighbor Freddie Helper in three episodes of the sitcom, didn't stick to acting after 1973 (via IMDb), but his small part in one of the most famous sitcoms ever made is still something he gets asked about occasionally in his adult job as a video game designer, like in this episode of the Matt Chat series hosted by Matt Barton. 

Unfortunately, Oliphant's experience on the show doesn't seem to have been quite as personally fulfilling as Larry Mathews' was. "When you're on the show, everyone's friendly, everyone's nice, but I don't think I even went out to eat with Ritchie on the show," he admitted, seemingly suggesting that he wasn't too close off-screen to his on-screen friend. "It's not like afterwards I made friends with Dick Van Dyke and we'd hang out," Oliphant went on to say.

Oliphant's claim to fame was as the son of Jerry and Millie Helper (Jerry Paris and Ann Morgan Guilbert) on "The Dick Van Dyke Show," but as he shared in the above interview, he's since distinguished himself as a figure in the early history of video games, having worked on 1990s classics like "Stonekeep" as well as handheld games from Mattel. 

If reflecting on your own mortality by way of the mortality of the cast of "The Dick Van Dyke Show" has got you down, consider watching an episode or two now -– a sure way to cheer almost anyone up.