When was "Annabel Lee" written? How did she die?

The poem was written in

1849. 

The poem, "" does not state directly how Annabel Lee
died. 
In the 3rd stanza the line, "Chilling my Annabel Lee", and the lines
in the 4th
stanza, ..... , chilling / And killing my Annabel Lee" might
indicate that she died of
influenza or pneumonia which would have been common
in the 19th century. This is conjecture, of
course, since the poem does not
represent any one person in particular.  Many have speculated
that the
inspiration for the poem was Poe's young wife, Virginia Clemm, but she outlived Poe
so
her death was not an issue with him.