Normally, you can not civilly sue your employer for a work related injury, but you can in California if the employer ratified the assault and battery by the co-employee. If the evidence is clear that you merely defended yourself with reasonable force [and did not continue the fight when the co-employee was no longer a threat], then your being fired probably would not be considered ratification since they fired the co-employee. It is possible there was a breach of contract by the employer in firing you, but you would have to prove their was no grounds to do so. If the employer created a hostile work environment and that resulted in the other employee attacking you, you might have a case, but you need to see some local personal injury attorneys to see if you do have a case and whether it is worthwhile. Under Workers' Compensation law, the employer has to pay for your reasonable medical bills and the time you were unable to work, but may be entitled to an offset in any civil suit for similar benefits already paid?
Answered on Sep 15th, 2015 at 7:26 PM