Yes. A significant infection in his liver. It was slow growing and he was showing symptoms of being "off" for weeks. But his symptoms at the time more logically pointed to a million other possible things that I was addressing, so a vet visit never quite seemed warranted. His death was sudden and unexpected. He was very young and my first snake.
His loss shredded me. I felt like I failed him. You know...hindsight...
This community was wonderful to me throughout, though. You need to be around those who truly appreciate what it's like to love and lose these guys, and it can be hard to find in the "real world".