Also in a beloved role as Alfred Bester in Babylon 5. I also just read he still did voice acting for star trek as recently as a couple years ago!
He will be missed.
He lasted longer than most. B5 cast tend to sadly check out early. Good run mr Koenig.
Also lasted longer than Anton Yelchin who played Chekov in the reboot movies and who was unfortunately crushed by his own Jeep at only 27 ten years ago