Mark Bruner was a villain from Law & Order - a cab driver who over a few years brutally raped and killed over a dozen teenage girls, and kept their bodies in a secure location where he would go to admire them as he left them out to rot. He took sadistic amusement at the suffering of the hundreds of mothers of missing girl's who he killed, and he refused to disclose the location of his victims so that their families would suffer, he also wanted Jack to suffer knowing that he couldn't move him to tell and couldn't give the parents the closure they so needed.