Do I have a case? If so is it criminal/civil or both?

A co-worker pulled a knife on me at work just minutes after I spoke with a supervisor about that person's aggressive and disruptive behavior in the workplace. The next day I was terminated while the employee who threatened me with a knife to my stomach was allowed to keep her job. The reason given was that I voiced my displeasure after the incident. The supervisor was negligent in the fact that I was proactive in alerting of a potentially harmful situation. Warning signs were there and I took the necessary steps. The big issue is that she's a woman, I'm a man. It's important to note I never touched anyone and no-one is accusing me of such, as the events were in view of surveillance cameras. This proves I wasn't the aggressor. My well-paying job was taken away from me and the reason fabricated in a successful attempt to save the employment of a co-worker who was clearly in violation of both the law and company policy. Something really wrong happened here and I need legal advice.