In Dexter: Resurrection Season 2, we learn what happens when a killer becomes ironically aware of his own mortality and enters into a midlife crisis when he realizes he can't quite kill like he used to.
Dexter: Resurrection is a return to form in the best way possible, paying wonderful fan service to fans of the original series.
If you loved Dexter, you'll want to watch Dexter: Original Sin, the prequel spin-off that tells Dexter's origin story.