Do you make these mistakes with your problem employee?
Here are articles about discipline and termination.
Employee Written Warning Blog
How to Fire Employee Protect Your Company from Termination Lawsuits: Use A Written Reprimand Giving Proper Reasons for Firing an Employee Help Avoid Legal Problems Insubordinate Employees in the Work Environment Terminate Employees with Care to Avoid Business Troubles Tips for Conducting Employee Investigations Before Termination Employee Written Warning Need Not Be Long, Involved