Fan Casting Batman: Tally Marks

Notorious serial killer Victor Zsasz has entered a plea deal to reveal vital information about Gotham's crime families to avoid the death penalty. However an attempt on his life by a mysterious assassin, The Tally Man, causes the Batman to help protect him, despite his own misgivings on the matter. So it's up to Batman to figure out who sent the Tally Man and get Zsasz to testify, only things aren't quite what they seem to be...