In the 3rd episode of Nine Bodies in a Mexican Morgue, Carlos, Kevin, and Sonja trekked up a treacherous hill to plant the Elt on top of it and signal a rescue helicopter to the location of the survivors of the plane crash. But the mystery killer who had been circling them stabbed Carlos during one of his nocturnal workout sessions and even unplugged the Elt from the antenna it was connected to. While the identity of the murderer continued to be a big question mark, the reason behind the murders became apparent: there were drugs inside the body of the plane. So, someone was clearly killing off the survivors so that nobody would learn about those drugs, which were worth millions of dollars, and try to earn off of them, thereby eating into the mystery person’s share. Now, we learned about these drugs because of a wild gecko.