I hope this message finds you well, present circumstances excluded. I am a licensed attorney with over a decade of employment law experience. It is a pleasure to assist you today.
First off, I am sorry you are having to deal with this issue. As you likely know, when a person is employed at will they can be terminated for any reason or no reason at all. Therefore, most terminations are legally defensible. That said, you case may fall into the category that is not legally defensible.
There is an exception to lawful termination of an at will employee when the termination violated public policy. In this case, the public policy would be that you cannot or should not terminate an employee when that employee is the recipient of workplace violence and just asked for something to be done about it.
As such, you have a cause of action for wrongful termination in view of the public policy exception. I cannot tell you that this is a sure fire win of a case, but I can tell you that you have a legitimate cause of action that could result in you receiving damages and attorney.
You have been wronged and the employer was legally in the wrong and not within their rights to terminate you in view of the facts that you have shared with me.
Let me know if you have any other questions or comments.
Please rate my answer positively (three or more stars) as well.
Best wishes going forward!