When the CUCM End User is deleted, the corresponding CUC user should automatically be deleted as well. Sometimes this isn't the case and the CUC user still exists and cannot be deleted due to other database hooks.
First you will need to find the ObjectId for the user that you want to remove from Connection:
run cuc dbquery unitydirdb SELECT ObjectId from vw_User WHERE Alias = 'alias of the user you want to delete'
Now you will want to delete that user as such (this will fail if there are database hooks still on the orphaned user):
run cuc dbquery unitydirdb EXECUTE PROCEDURE csp_UserDelete (pObjectId = 'objectid from above')
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