I just found Byron. He was around the side of the house in some moderately thick undergrowth, dead, and as stiff as a board.
Needless to say, Sarah and I are quite upset. You couldn't ask for a better cat. He was so affectionate and personable. The last time Sarah saw him yesterday he was chasing something, we can only assume it was a snake or something that didn't agree with him. It's just such a shame. He will be missed.