: The team is called to a campsite where a Petty Officer has been killed. They partner with National Parks Service Agent Gage Winchester, who happens to be Special Agent Jessica Knight's ex-boyfriend .
In , titled "Leave No Trace," the team investigates the murder of a Petty Officer at a National Park campsite, leading to a collaboration with the National Parks Service. Key Plot Points
: Much of the episode focuses on her past relationship with Winchester and the current dynamic of her relationship with Jimmy Palmer.
: The team tracks down an RV at a nearby gas station containing the rest of the smuggled cocaine, which belonged to a Guatemalan drug ring. The episode ends with a personal moment between Knight and Jimmy Palmer, where she delivers a note from Winchester acknowledging Jimmy is a "good man". Character Highlights
: It is eventually revealed that a man named Walsh was responsible for the murder. He was hiking in to retrieve the dropped drugs and killed the Petty Officer who spotted him. When he couldn't find the cocaine (because the bear had already eaten it), he turned himself in to avoid the wrath of his partners.