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This is Dr. KV. I am so sorry for your loss. It sounds like your bird may have gotten tangled in something...do you have any rope toys in his cage? It may have strangled him by accident.
You could take his body to your local bird vet for a necropsy to determine the exact cause of death.
Probably not. Another possiblity would be choking on something....maybe a larger seed or object in the cage? Do you have any other pets?
Ah, that sounds like he may have choked on something or possibly flew into the side of the cage and hit his head. Have you ever seen him fight with the his cage buddies?
Thank you for the additional info. Based on that info, my best guess is that he got upset and flew against the side of the cage, which broke his neck and caused the abnormal beak position you observed. A local bird vet may be able to tell you more if it would help provide closure.
Feel free to reach out if I can assist you further. I am so sorry for your loss.