
Dexter's most significant kills —
Dexter Morgan has killed a lot of people during the eight-season run of Showtime's "Dexter," which concludes Sunday night. Some of the slayings rose above the level of your run-of-the-mill "bad guy." Take a look at some of the most significant kills this TV serial killer made along the way. Warning: This gallery contains spoilers!

Dexter's most significant kills —
In season one, the Ice Truck Killer kept all of Miami in disarray. When it is revealed that the man behind it all, Brian Moser, had not only dated Dexter's adoptive sister, Debra, but was in fact Dexter's biological brother, you understand why this kill had a lasting effect.

Dexter's most significant kills —
In season two, Dexter went to great lengths to track down Santos Jimenez, the man hired to kill Dexter's mother. She was a confidential informant, and lover, to Harry Morgan, Dexter's adoptive father. Dexter, as a toddler, was present at the murder and it was one of his earliest memories, and the event that triggered his dark side.

Dexter's most significant kills —
Lila West was a lot of things to Dexter -- Narcotics Anonymous sponsor, lover, confidante, attempted murderer; at one point he considers that she might be someone who truly understands him. After she killed Sgt. James Doakes, and later kidnapped Dexter's step-kids and tried to kill them, herself and Dexter -- it was clear she had to die.

Dexter's most significant kills —
Oscar Prado is killed by Dexter in self-defense, but contrary to the code he uses to choose his kills. Add in the fact that he was the brother of District Attorney Miguel Prado, and this single kill sets the path of the third season.

Dexter's most significant kills —
Dexter takes another foray into friendship with District Attorney Miguel Prado and the two decide to work together to further Dexter's agenda. Clemson Galt, who killed his girlfriend for getting pregnant. Incarcerated at the time, Galt was a target Dexter couldn't reach without Miguel's assistance.

Dexter's most significant kills —
Camilla Figg wasn't a bad person at all. Rather she was a coworker who helped Dexter gain insight into his past. When she was dying in the hospital from terminal cancer, Dexter put her out of her misery, showing his caring side.

Dexter's most significant kills —
Dexter's attempts at friendship rarely end well, and Miguel Prado is no exception. After Prado kills an innocent, fellow attorney and rival, Ellen Wolf, and Dexter realizes that he was planning to kill Lt. Maria LaGuerta, it's clear to Dex that he's uncontrollable and he puts him down.

Dexter's most significant kills —
Jorge Orozco, aka George Washington King aka The Skinner, was tracking Dexter in order to find one of Dexter's other targets who owed him money, and killing pretty much anyone who got in his way. Orozco abducts Dexter, and is planning to torture him, but Dex manages to escape and kill Orozco.

Dexter's most significant kills —
Arthur Mitchell was on Dexter's kill list due to the fact that as The Trinity killer he'd done in over 100 innocent people as the most prolific serial killer in the U.S. Dexter spent a long time studying this victim, even keeping him from committing suicide at one point, before taking him out. After he finally killed Mitchell, he arrived home to find that Trinity's final victim was Dexter's wife -- leaving their son, Harrison, crying in a pool of her blood. The scene is reminiscent of Dexter's own memories of his mother's brutal death, bringing a gory end to season four.

Dexter's most significant kills —
Boyd Fowler was the cleanup man for a group of torturers, rapists and murderers, disposing of women in barrels in a swamp. After killing Fowler in his own house, Dexter finds one of Fowler's victims, Lumen, witnessed the act and rescues her. He takes Lumen under his wing as a partner to track down and kill the rest of Fowler's team, which takes up most of season 5.

Dexter's most significant kills —
The death of Cole Harmon, another member of the team that tortured Lumen, didn't go quite as planned. He recognized Lumen while she and Dexter were tracking him, and she was barely saved by Dexter. Dexter kills him as Lumen watches.

Dexter's most significant kills —
Motivational speaker Jordan Chase was the mastermind behind the serial killer gang that had tortured and raped Lumen. After Dex and Lumen track down and kill the rest of his buddies, he lures Lumen into a trap. Dexter manages to find them and again saves the day. He then allows Lumen the final victory of driving a knife into Jordan's chest. This cathartic event freed Lumen of her burden, allowing her to go on with her life elsewhere, and making her one of the few living people that know his secret.

Dexter's most significant kills —
Stan Liddy was a former dirty cop turned private investigator who obtained evidence that would reveal Dexter's deadly secrets. Dexter killed him after Liddy abucted him and was planning to expose Dex to get his job back as a cop. Another kill that doesn't quite meet Dexter's code.

Dexter's most significant kills —
Season six sees Dexter going down the rabbit hole tracing the Doomsday Killer. He at first befriends Travis Marshall, thinking Professor James Geller to be Doomsday. He later learns that Marshall has killed Geller, and is in fact the real Doomsday killer. He finally brings Marshall to justice -- plunging a sword into his chest, just as his sister, Debra walks in seeing the kill. At the beginning of season seven, we see Dexter convince Deb that he was surprised by Marshall while collecting evidence and killed him on impulse, but she later discovers the truth and he comes clean.

Dexter's most significant kills —
Ray Speltzer was chosen by Dexter to show Debra that his cause was a just one, getting rid of criminals that the police could never bring to justice. After almost killing Deb, Speltzer later captures and attempts to do in Dexter, chasing him through a crazy killer maze before Dexter jumps from a roof to escape. Dexter finally catches him unaware, subdues and kills him.

Dexter's most significant kills —
Clint McKay was the abusive father of Hannah McKay, a serial killer in her own right that Dexter falls in love with. Dexter kills Clint, not in line with his code, but because of how he treated Hannah.

Dexter's most significant kills —
Dexter gets final revenge for the death of his mother when he kills Hector Estrada, the drug kingpin who ordered her death.

Dexter's most significant kills —
Dexter had lured Captain Maria LaGuerta to the spot where he killed Estrada, planning to make it look like they killed each other. LaGuerta was sure that Dexter was a killer, so she had to go, code or no. But before he could finish her off, his sister Debra shows up and shoots LaGuerta to save her brother in the season seven finale. So while Dexter didn't kill her himself, he was largely responsible for her death, and for making Deb a murderer.

Dexter's most significant kills —
Season eight has been spent chasing the Brain Surgeon with several false leads. We'll have to wait to see how, or if, Oliver Saxon meets his end in the show's finale.