Originally Posted by
Arctic Cyclist
He does, but like most effective and successful serial killers he never established a pattern to make it easy to identify or find his victims. Therefore he won't face the death sentence because law enforcement has an obligation to try and find all of the people he's killed. He's a life without possibility of parole sort of guy. Ironically, the more prolific a killer is, the less likely he is to experience severe punishment. Especially if he's, or in rare cases, she's, good at flying under the radar and avoiding notice.
More than that, there's a good chance that many of his murders have convictions. The lawyers for those people who are trying to prove that he and not their client committed the crime have a vested interest in his survival. Because he traveled extensively, because he never developed a particular signature, he's not likely to fry. There are other people who will have received the death penalty for a crime Jr committed who desperately need him to confess.
Unlike most of Gotham's rogues, James Gordon Jr is someone who's continued survival does make sense.