Dexter: The Top 7 Most Vicious Killers
6. Doomsday Killer aka Travis Marshall (Colin Hanks)
Misleading the Miami Metro Police through the majority of Season 6 that the Doomsday Killer was Professor James Gellar, Travis Marshall emerged as a much more screwed up guy than the devout Christian follower of Gellar that Dexter believed him to be. Having killed Gellar and taken on the extra personality of said Doomsday Killer, Marshall murdered multiple people, using the bodies to stage the Book of Revelations' description of the apocalypse.
Whether he believed himself to be under the orders of Gellar the whole time or not, Marshall murdered his own sister and attempted to not only poison the entire Miami Metro Police Department but also kill little Harrison, Dexter's son.
7. Boyd Fowler (Shawn Hatosy)
Fowler was responsible for clean-up after the rape of thirteen women by Jordan Chase and "The Group." His job was to kill and dispose of the bodies. As a dead animal pickup officer for the Department of Sanitation, it was easy to disguise any disposals as simply his job. Though he claimed he was helping the women by killing them, his collection of hair trophies proved otherwise.
Dumping the bodies in barrels of water and electrocuting them by connecting jumper cables to the rim, Fowler obviously enjoyed his job. What he didn't expect was for Dexter to figure him out and let loose Lumen, who finished off the rest of his group.
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