In Batman issue #38 we meet Matthew Warner, a kid who idolises Bruce Wayne so much that he kills his own parents. He stabs them a bunch of times in order to frame Victor Zsasz, then kills Zsasz's parents too.

But weren't the death's of Zsasz's parents something that happened many years ago in his origin story? They left their fortune to him, he gambled it away and he became a serial killer when he had nothing left?