Jack passed during the night. Given his behavior yesterday afternoon/evening, I kind of expected it - he'd snuggle a little bit, but then he'd keep crawling off to a quiet corner behind some furniture. When the boy was getting ready to turn in for the night, I told him to show Jack some love and to say his goodbyes. I'm glad I did - when the morning rolled around, I think that the boy took the news much better than he would have, otherwise. Man, from four animals to one, in the span of a little more than two years.
I have a feeling that the boy is going to ask for a kitten for Christmas.