Burt's trigger finger.
Samantha would be my second.
The writing and character development is phenomenal!! I know that part of why I like Sam's character is that she is connected to Datu and Hope. Her death seemed untimely in retrospect because Riley and Angel sprung Datu and Kaylani shortly after Samantha was hauled off to the arena, and later we discovered that her daughter is alive. Just seemed like her character had a lot to live for...though, if she had survived she would likely just be doing laundry at the colony and Hope would have been a 3rd-4th tier character instead of being a "village's child" and a focal point for Datu and Tanya.