So happy that your Murray came home. A similar thing happened to my friend's sister. They lived next to a wooded area. They caught their cat in a humane trap about a week after he went missing. He was crazed, trying to scratch and bite anyone that got near. They thought he might be sick so they took him to the vet. Turns out their neutered male miraculously became intact again. They had caught a feral cat that wasn't theirs. Their cat came home two days later like nothing was wrong. $250 later, that feral cat had all of its shots, got neutered, and sent back to the wild. All's well that ends well, I guess.