Today I learned from Barbara Schnell that Zorro died unexpectedly a few days ago. Barbara says she'd known this horse almost all of his life, and she's very close to his rider, Jessica Suess. Obviously this came as a big shock to everyone who knew and cared for Zorro.
Here is an article explaining what happened. Apparently he had a gastric ulcer that ruptured suddenly. Not something that could have been prevented.
My condolences to Barbara, and to Jessica! Zorro was a beautiful horse, and I'm glad we got to see him on the video.