Bantam rooster died very quickly, any info?!
Sorry for your loss. How old was he? It is sometimes hard to guess what went wrong without a necropsy by your state vet. He could have had some organ failure, but without examining him from head to toe and picking up on symptoms, it can be hard to know what happened. Diarrhea can be a symptom of so many illnesses. Hopefully this was not contagious.