Wow, that's ashame. True, Olsen wasn't the greatest actor but, I liked him on Little House and we used to watch Father Murphy all the time. It was like he was a gentle giant. Peacable but, don't tick him off, or else.
Yes, what I should have written was he wasn't a particularly good actor, I thought he was an OK actor though. I did a search for information online and it seems he has mesothelioma, and is now suing NBC for apparently exposing him to asbestos. It seems strange that nobody else on the Little House developed the disease.