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If you're asking for reasons why he might have died, need a bit more information. What did he look like--any spots or injuries? Have you checked your water parameters? Did any new fish recently get added? Is there a chance something not tank water or fish food could have gotten into the system? How are the other fish acting? How old was the fish?
Well I Added Him 2 Days Ago Along With 2 Other Cories Which Are Still Alive.
No Injuries
No Spots
Fed Him 2 Hours Before Death
But Was Staying In Same Place Alot Not Moving
I would think he was either A) ill but not showing (I'm told ick can "hide" in the gills) or B) was weak genetically and the stress of the move after the move to the fish store was too much for him. I'd watch the other fish for signs of illness.