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After reading your posts, I remembered something I'd read about a virus, Newcastle Disease Virus, or NDV. NDV affects the respiratory, nervous, and digestive systems. Symptoms are variable depending on the strain of virus, species of bird, concurrent disease and preexisting immunity. The incubation period for the disease ranges from 2 to 15 days.
An infected bird may exhibit the following signs:
Respiratory: sneezing, gasping for air, nasal discharge, coughing
Digestive: greenish, watery diarrhea
Nervousness, depression, muscular tremors, drooping wings, twisting of head and neck, circling, complete paralysis
Partial to complete drop in egg production and thin-shelled eggs
Swelling of the tissues around the eyes and in the neck
Sudden death
If your bird had NDV, then there is nothing you could have done to prevent its death.