Dan Stevens is voicing Korvo. Criminal charges against Justin Roiland were dropped for insufficient evidence; but there seems to be non-criminal complaints against him by multiple people that more directly relate to the work place as well. A criminal investigation was probably just the last straw. I personally don’t care for Rick and Morty or Solar Opposites, so I didn’t know much about it and had to look it up; but I doubt he’s wanted back if he was causing problems in the work place.