Prior to the events of Dexter, Mike succumbed to his desire to rape and kill children and became a serial rapist-killer. His first know victims were three young boys named: Corey Balanti, Tyler Kale and Joe Bigalow, much to his disgrace, Dexter aka The Bay Harbor Butcher eventually discovered that he was in fact, a child murderer. Visibly enraged by this, Dexter brutally murdered Mike.
- Mike Donovan has 4 victims in Dexter: The Game and 7 victims Darkly Dreaming Dexter.
- Mike Donovan was the first person to be killed by Dexter in the show and the novels (not chronogically).