Episode 23: Trigun

Wolfwood's death occurs precisely because he tries to follow Vash's morals by sparing Chapel. His final moments are spent lamenting that he realized too late that a different way of life might have been possible.

After defeating Chapel but choosing to spare him—marking the first time Wolfwood truly adopts Vash's "no-kill" policy—he is betrayed by Legato Bluesummers, who controls Chapel to shoot Wolfwood. Key Themes and Symbolism

This episode is heavy with religious and philosophical symbolism, primarily centered on Wolfwood's "redemption".