State police or FBI might look into whether police broke the laws. As for the civil suit, virtually every agency and every officer involved, and then a few extra for good measure, can expect to be named in a civil rights suit by Mr. Dorner's estate. Whether that suit stands any chance of winning is an entirely and, at this juncture, unanswerable, question.
I'm a lawyer, but I'm not your lawyer. If you need some honest-to-goodness legal advice, go buy some.