I hate to write this post, but all of you have been part of Inkblot's life for so long that I can hardly not do it. One of our neighbors saw the flyers we posted around the neighborhood and called a few minutes ago to tell us that she had seen the body of a cat nearby. We went out to look, and it was Inkblot. There wasn't much question about the ID.
From the evidence, it looks like he got killed by a coyote. And he hadn't wandered very far after all. The remains were only a couple hundred feet from our house.
This is sad, sad news. But I want to thank everyone who sent kind thoughts our way, either via comments or email. He will be remembered.