I totally agree with Avika. The only thing I want to add here is that when you proceed further in such matters, you need to be extra cautious, as just a small error can vitiate your inquiry. Give him sufficient time to pursue his case, and do not proceed hastily in such matters. Record every proceeding conducted in the inquiry. If possible, take the signatures of a fellow workman of the concerned employee as a witness if the chargesheeted employee doesn't participate or cooperate in the inquiry. Before finalizing the inquiry report, please send the draft report and recommendations to the employee for his comments. If he does not respond or his comments are found unsatisfactory, inform the employee about the same through mail, and only then finalize it.
Our Labor Courts are biased towards workmen, and they need only one thing to strike out the management defenses. Don't give them that chance.
Regards,