Tracker's newest episode had Justin Hartley's Colter Shaw looking for a missing girl in a possible murder case - but was he able to track her down alive? The Sunday, December 7, episode of the hit CBS series showed Colter helping a grieving mother one year after her daughter disappeared from their home. The mother was struggling with alcohol addiction at the time and woke up to find her little girl missing - in addition to blood at the scene that hinted at an injury.