A New Article By Kim Morgan about "The Amazing Creation of Lars Thorwald"
Big, hulking, white haired Lars Thorwald is another one of Hitchcock's lead-ups to Norman Bates -- both men have sympathy to go with their terrifying sides, and both men like bladed carving instruments.
I can't get the link, but a writer on film named Kim Morgan has put out an article on Rear Window this week(as liner notes for a screening) and though it covers other bases, the focus on Thorwald -- in his blue suit and blue eyes -- is quite good.
You should be able to find it...