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In the fourth season premiere, a 1995 case involving two teenage boys who committed suicide after going on a murderous rampage at a local mall is reopened when evidence shows there may have been a third shooter. When a videotape of the shooting is discovered hidden in an air vent in the mall, Rush and the team notice that the third shooter managed to leave the crime scene by pretending to be a survivor. Now, the investigators must reconstruct the lives of the teenage boys and the events that led up to that fateful day, along with interviewing all of the survivors again.
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