help removing user from my system

[brendon]

hi there all i had a account here on my system for my flat mate who has 
moved out,  i went to the system->admin->users groups(on the desktop) 
and deleted them as a user but there home directory still remains how do 
i delete there home directory ie /home/nat

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  Brendon Toogood
  Ubuntu Linux Advocate
  Linux Registered User #417189

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