You have raised several separate issues which may include improper termination, criminal charges against the employee and possible negligence claims against the employer if they knew and did nothing. Depending on the specific circumstances of your case, it appears as though you have a civil battery case against your attacker and a failure to supervise, failure to protect and/or failure to provide a safe work environment case against your employer. We advise you contact an employment lawyers and consider an injury attorney who has experience with harassment suits.