This tab is not close to 100% correct, please contribute.
h=Hammer-on

Riff One (Listen for the timing.)
E|---------------------------------------------|
B|---------------------------------------------|
G|-------6--------------6----------------------|
D|-9------------------9------------------------|
A|---------------------------------------------|
E|---------------------------------------------|

Main Riff
E|----------------------7h8--10h11-------------|
B|-------------7h8--11-------------------------|
G|-----7h9h10----------------------------------|
D|-11------------------------------------------|
A|---------------------------------------------|
E|---------------------------------------------|

What a tragedy.
Aaliyah Dana Haughton 
Jan. 16 1979- Aug. 25 2001