Below is a list of the 149 known people that Dexter directly killed, along with their basic causes of death. Note: The episode is linked to each one where it happened or was mentioned.
“I am lucky. What do I know about abuse? Without the Code of Harry I’m sure I would’ve committed a senseless murder in my youth. Just to watch the blood flow.”
Before Blood Slides
1. Nurse Mary – No blood taken. Stabbed in the chest. (“Popping Cherry”/”Original Sin” )
2. Unnamed Victim – No blood taken. Killed between Mary and the Drug Dealer. (“Every Silver Lining…”)
3. Unnamed Drug Dealer – No blood taken. First victim to whom Dexter showed photos of their own victims. (“Every Silver Lining…”)
4. Juan Ryness – No blood taken. Stabbed in the chest. (“There’s Something About Harry”)
5. Robert Milson – (1994) No blood taken. Stabbed in the chest. (“Dark Echo: Chapter 2”)
6. Peter Thornton – (1994) No blood taken. Neck sawed through with a circular saw. (“Dark Echo: Chapter 6”)
7. Unknown Victim – No blood taken. Identified via a defunct website as being killed right before Alex Timmons, whom Dexter stalked on the same night, witnessing him on the roof.
8. Wiggles the Clown – No blood taken. Stabbed in the chest. (“The Family Business”)
Blood Slide Box 1
9. Alex Timmons – First blood slide. Stabbed in the chest. (“Return to Sender” / Alex Timmons (Early Cuts) has an inconsistent date of 2003) (Dexter told Alex that he had killed dozens of people by this point.)
10. Gene Marshall – Blood slide taken in series / No Blood taken in Early Cuts. Throat slit with a utility knife, head beaten with a flashlight, and crushed by Dexter’s car. (“Return to Sender” / Gene Marshall (Early Cuts) has an inconsistent date of 1993)
11. Coleman Lindquist (2000) – Blood slide shared with his father. Decapitated with a hacksaw. (“All in the Family (Early Cuts)”)
12. Max Lindquist (2000) – Blood slide shared with his son. Decapitated with a hacksaw. (“All in the Family (Early Cuts)”)
13. Larry Mueller (2000) – Blood slide. Identified by LaGuerta. (“There’s Something About Harry”)
14. Anthony Rodrigo (2002) – Blood slide. Sawed with a cordless reciprocating saw. (“Morning Comes”)
15. Cindy Landon (2004) – Blood slide. Cut in half with a chainsaw. (“Return to Sender”, “Cindy Landon (Early Cuts)”)
16. Walter Munro (possibly 2005) – Blood slide. Implied to have been killed in a flashback. (“Surprise, Motherfucker!”)
17. Marcetti (2006) – Blood slide. Captured after meeting Rita Bennett, body disposal is seen later (flashback). (“My Bad”)
SEASON 1
58. Mike Donovan – Blood slide. Neck sawed through with power saw. (“Dexter”)
59. Jamie Jaworski – Blood slide. Decapitated with a cleaver. (“Dexter”)
60. Matt Chambers – Blood slide. Stabbed in the chest. (“Crocodile”)
61. Jorge Castillo – Blood slide. Unclear method, likely stabbed (“Love American Style”)
62. Valerie Castillo – Blood slide later used to frame Jorge. Carotid arteries sliced with knife. (“Love American Style”)
63. Emmett Meridian – Blood slide. Neck sawed through with power saw. (“Shrink Wrap”)
64. Brian Moser – No blood taken. Neck slashed; made to look like a suicide. (“Born Free”)
SEASON 2
65. Little Chino – Blood slide. Stabbed in the chest with his machete. (“Waiting to Exhale”)
66. Roger Hicks – Blood slide. Stabbed in the chest. (“An Inconvenient Lie”)
67. Ken Olson – No blood taken. Decapitated with a cleaver. (“Dex, Lies, and Videotape”)
68. Santos Jimenez – Blood slide lost. Dismembered with a chainsaw. (“Morning Comes”)
69. Jose Garza – No blood taken. Neck sawed through with power saw. (“There’s Something About Harry”)
70x. Esteban Famosa – No blood taken. Killed off screen, presumably neck snapped. (“Left Turn Ahead”)
71x. Teo Famosa – No blood taken. Shot in the chest, with assistance from James Doakes. (“Left Turn Ahead”)
72. Lila West – No blood taken. Stabbed in the chest. (“The British Invasion”)
And Many More….