Batman interrupts the Ripper as he is about to claim his next victim . Batman chases the Ripper throughout Gotham and the two eventually come to a stop at the grave of Thomas and Martha Wayne , where it is revealed that Jacob Packer is the Ripper . Packer had been trained in medicine and law with the money of Thomas Wayne , but he was driven insane by Martha Wayne 's rejection of his advances . Since then he was killing women who resemble Martha to silence the laughter of Martha he heard in his head .

Question: whos jack the ripper in gotham by gaslight
Answer: Jacob Packer