it's a big case. >> he was surprisingly calm. he was very quiet. didn't show much emotion at all. >> isaiah told investigators the same story he told jake. he picked halee up and dropped her off at the local park. what he did not know was that more than one dozen investigators were watching his interview remotely from the next room. they had proof he was lying. they checked park security cameras, and there was no trace of isaiah and halee. cell phone data showed where they had really gone. to the soccer field where halee's body had been found. >> we saw him leave her apartment complex. the cell phones are traveling together. >> they are definitely together at this point if you go by

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