On the emotional side, I would hope the guy is identified and brought to trial. At trial and in every news statement I would make it a point to say I forgive him. The day he is released from prison I would make it my lifes mission to make sure he never had a good day. I wouldn't kill him right out, but eventually he would wish I did.
Of course the reality is, I would let justice prevail and be happy with whatever the courts decided...