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Adnan never attempted to search, or contact Hae after Janueary 13th. This point to the fact that Adnan knew Hae was dead before her body was ever found.

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In order to carry out Hae's murder, Adnan spent time planning it. If adnan wasn't planning on killing Hae, why would he give his phone and car to Jay?

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Hae was a well liked girl, and no one else had motive to kill her besides Adnan.

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If someone else had committed Hae's murder, the police would've uncovered the evidence by now. Jae would be an obvious person to point fingers at, but police would've convicted him had he been guilty.

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In typical murder cases, strangulation of a victim means their attacker had a person connection with the victim. Adnan would have had a close connection with Hae, and the act of attempting to bury Hae in the woods, could have been an act of remorse.

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Neither Jay, nor Adnan's stories seem to have much truth to them, which could mean they are covering up for one another.