Hal Jordan is found dead in the "Lanterns" premiere's final scene, with his ring missing and his murder set up as the series' central mystery.
Damon Lindelof said making one of the Green Lanterns the victim raised the stakes and tied the case directly to wider DCU implications.
Chris Mundy said the writers also considered killing Sheriff Kerry but dropped that path to avoid a "fridging" trope in which a woman's death motivates male heroes.
Episode 2 now opens with John Stewart investigating the killing, turning Hal's death into the engine for the HBO and Max series' Earth-based crime story.