Daniel Vogel is Dr. Vogel's estranged psychopathic son and The Main Antagonist of the Final Season. She sent him to a mental institution after he killed his father, and he eventually faked his death and came to Miami under the alias of Oliver Saxon, living as a building inspector. He became a serial killer known as the "Brain Surgeon"; he removed the parts of his victims' brains which contained empathy and left them on his mother's doorstep. Vogel asks Dexter to help her track the Brain Surgeon down, unaware of his identity. Dexter unknowingly meets him when Saxon begins dating Dexter's neighbor Cassie Jolleston. After Saxon murders Jolleston and Dexter's apprentice Zach Hamilton, he realizes his identity. Saxon and Dr. Vogel reunite, but Vogel eventually decides to let Dexter kill him after seeing a videotape of Saxon murdering one of her patients. Saxon, aware of the plot, slits Vogel's throat, killing her, in front of Dexter. Dexter later tracks him down and ties him to a makeshift kill table, but chooses to let Deb hand him over to the police. However, Saxon is freed and shoots Deb. Saxon is later killed by Dexter in the series finale.