It would seem that you may have been in an astral/dream state that made you receptive to psychic information or knowledge about the event. I don't know if you could pass the information along somehow clearly stating that, "this is what I saw in a dream" or if there are any anonymous hotlines set up, you could pass along the info sawing what you saw in the dream. Of course, there is no proof that what you saw is actually what happened, but it could also give anyone investigating the case leads to missing information. It may be that your are very empathetic and can feel the father's pain.