At a minimum, the widow can sue the restaurant. Whether she can get any farther than that is the question. But if I were the lawyer, I'd make the argument.
I don't think it was the Mayor's restaurant. This isn't the only city with this stupid policy of not cooperating with the Immigation feds. The problem is also with the fed agencies reluctance to hold for deportation.
What a perfectly leftism idea! What did the restaurant have to do with the homocide?