How did Edgar Allan Poe die, or what are some theories for his death?

I hear that Edgar Allan Poe died a long time ago but, his death is a mystery. Other websites say that he died from overdoses and alcoholism addict. I belive this but then again there are the other possibilities so say other websites. You don't have to have the correct answer, I would just like to know either your theories, gusses, and maybe some answers that were told by professers or any other sort of educated people.