I had the good fortune to be able to spend some quality time with Orson late one Sunday afternoon shortly before he died. He was playing with the big plastic toy that was sort of an oblong shape weighted on the bottom, so it rolled around and bounced back towards him when he batted at it. I hung out there for about 45 minutes before the Zoo closed, and outside of a couple of other people who only stayed a few minutes, it was just us. It was pretty dark in the canyon, and all I had was my 300mm lens, so I could only get close-up shots.
When I first got there he was resting, but still very much alert.
After a bit he got up and started playing with the big plastic toy.
If you look closely you can see his Jaguar markings under that black fur.