The mystery of Ashton Shaw's death has haunted the CBS series since its first episode. The season 2 finale of Tracker found Justin Hartley's Colter Shaw learning the answer to a question that's plagued him the entire series — who killed his father?

This interview contains spoilers from “Echo Ridge,” the Season 2 finale of CBS’ “Tracker.” As a self-described lone wolf survivalist, Colter Shaw (Justin Hartley) has used his expert tracking skills to help crack all kinds of mysteries for private citizens and law enforcement across the United States.

Tracker Season 2 came to an end with episode 20, and while the episode did shed light on some burning questions, it also concluded with a huge cliffhanger and shocking revelation.