Could it possibly be IBD (Inclusionary Body Disease)? IBD can kill pythons extremely quickly, and he may have contracted it while in the vets office?
And I am sorry for your loss. I had to euthanize one of my leo's after she had suffered for close to two months. It was really hard, but had to be done. I hope you can find out what happened, and i hope the rest of your collection is fine.
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