Conversation so far:
is the death of the rev and nightmare the name of an album by avenged sevenfold?
CANNOTANSWER.
tell me more about what happened between 2009-2011?
In January 2009, M.
Shadows confirmed that the band was writing the follow-up to their self-titled fourth album within the upcoming months.
What was the name of that album?
the band's drummer James "The Rev" Sullivan was found dead at his home.

Question: what did he die from?
Self-contained rewrite: What did James "The Rev" Sullivan die from?