While the actor may not be as well known for his work in genre as are others, I do recall him first coming onto my radar with his work aboard CBS's pretty interesting Apocalypse/Drama Jericho (2006-2008). For those of you who missed it (and, based on ratings alone, that may've been a good many of you), Jericho featured the residents of a small town in the heartland of America surviving against what appears to have been a near extinction-level event. When society begins to tatter and fray, these folks banded together to protect one another from the lawlessness and chaos. It lasted for thirty episodes -- it may've even had some life beyond the screen in a book or graphic novel format, though I'm unsure on that point -- and Mitchell was one of the talented players amongst the cast.
Thankfully, the man had other adventures in the realms of the Fantastic. His IMDB.com profile lists such projects as Odyssey 5, Meteor, Ghost Whisperer, Grimm, Tasmanian Devils (2013), Haven, Minority Report, Frequency, Captain Marvel (2019), Star Trek: Lower Decks, and Star Trek: Discovery amongst his resume ... and that's a very impressive run.
Our thoughts and prayers are extended to the family, friends, and fans of Kenneth Mitchell. May he forever rest in peace.
-- EZ