come home from work my cat was gone

I came home for lunch and my cat Nina was just fine and when I got home about 4 hours later from work, she was dead in the living room. She had thrown up everywhere. Had not been sick ever. She was 8 years old. I wonder if she choke to death with maybe food she had been eating or maybe hair balls. The biggest shock and so so hurt. Just like my brother he was getting ready to go to work and just died. These deaths are so much harder.  Any suggestions thank you

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