You would have to get a necropsy for sure but the symptoms are indicative of possible Cryptosporidosis infection (Crypto). It is a bacterial infection of the gut that causes syptoms similar to what you describe. The regurgitating being an indicator and the suddend death. Had you noticed any mid-body swelling that wouldn't be due to food? What is it that you feed them? I had 3.1 Langaha madagascariensis that all died within a week of each other about five years ago. They all ate wild collected Anolis carolinensis. We could not confirm for sure that the Anolis caused it but the only one of the group to survive without incident was an additional female who only fed on pinkie mice and thus the only difference between her and the others was the Anolis diet. A necropsy could tell you a lot if you have a local vet that knows their way around a reptile. Along with culturing the bacteria there is usually a thickening of the mucosal lining of the stomach. I don't know if you have other snakes but it is something that can be infectious so I would disinfect the cage with bleach immediately and the utensils that you use to feed and manipulate the snakes with.

Hope this helps

Brian Aucone

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