 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 brother, and he eventually faked his death and came to Miami under the alias Oliver Saxon, living as a building inspector.He became a serial killer known as the "Brain Surgeon"; he removed the anterior insular cortex (the part of the brain that controls empathy) from his victims' brains and left them on his mother's doorstep.