From Escape From Alcatraz to Christine, Roberts Blossom proved to be the ultimate character actor who added either weirdness or whimsy to almost every project he was associated with.
However, it was his staring role as Ezra Cobb, the murdering, grave robbing, taxidermist, in the 1974 movie, Deranged that puts him on my list of truly great actors. Had that movie been a mainstream film made ten years later, Roberts Blossom's performance would be mentioned as often if not more than Anthony Hopkins Hannibal Lecter in Silence of the Lambs.
Leading roles never followed, but wonderful character parts did, making the world of cinema a much richer place. Roberts Blossom is no longer with us, but his movies will live on. Spend some time to discover or rediscover him. It will be time well spent.