NightwingRJG

I remember reading a comic book issue where a dying detective asks batman to help him close the one case he was never able to do which happened to be Batmans parents death. I thought it was in the Gotham Knights series but i was wrong. Does anyone know what book and which issue it might have been? It is really bothering me that i can't remember. I would really appreciate if someone can give me a clue or the actual answer. Thank you in advance.

A i remember reading a comic book issue where a dying detective asks batman to help him close the one case he was never able to do which happened to be Batmans parents death. I thought it was in the Gotham Knights series but i was wrong. Does anyone know what book and which issue it might have been? It is really bothering me that i can't remember. I would really appreciate if someone can give me a clue or the actual answer. Thank you in advance.