Mangrum: One Killer Too Many

S1, E3: When teenager Katie Hamlin is found murdered and burned by the roadside, Georgia cops think her killer was an acquaintance, Jamerson Mangrum. He was the last caller to her cell phone and his DNA is on her body. When questioned, Mangrum talks about a party that got out of hand, but points the finger at another man, Roberto Rocha. Rocha tells a detailed story about how he and Mangrum dumped Katies body. Later, airline records prove he was in Brazil when she was killed! Why would he make a false confession? How did he know these details and who actually killed Katie? The interrogation footage shows how words and body language help investigators create a powerful case for murder.