My roommate moved out. He and i are both administrators on my iMac. How can I delete him? I have tried going into system preferences, users & groups, but even after I unlock it I cannot make any changes to his account.

  • 3
    Is he still logged in?
    – nohillside
    Commented Nov 28, 2014 at 5:28
  • 1
    Also a screenshot of "Users & Groups" after unlocking would help
    – nohillside
    Commented Nov 28, 2014 at 7:09
  • If you know his password log in the log out.
    – Ruskes
    Commented Nov 28, 2014 at 7:10

1 Answer 1


I got this hint from here http://applehelpwriter.com/2013/05/09/how-to-log-out-another-user-without-logging-in/

Log out the user or any other processes that is still running owned by the user you wish to delete.

  1. Open up Activity Monitor (/Applications/Utilities/Activity Monitor.app)

  2. Use the drop down menu in the Task bar to change the menu to ‘Other User Processes’ (note: you can use ‘All Processes’ in the menu if you wish, but that is less safe as it makes it possible to accidentally click on your own user process in step 4 below!).

  3. In the filter bar, type loginwindow.

  4. From the list of users that show up, for each one that you wish to log out:

    • click on its row in the Activity Monitor pane to highlight the process

    • press the ‘Quit Process’ icon in the Task bar above

    • from the resulting dialogue window, click ‘Force Quit’

    • supply an Admin password if requested.

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