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When Adnan walked up to the stand, he passed Jay and called him pathetic. This seems exactly like someone who's upset that they got caught would say.

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In Jay's testimony, he says that after the breakup, Adnan says "I'm gonna kill that bitch." This definitely sounds like it was a premeditated attack and subsequent murder.

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While Jay and Adnan are at Kathy's apartment, Adnan gets a call and he is heard saying "What am I supposed to tell them?" referencing the police. Is he trying to figure out how to cover up the fact that he murdered Hae?

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Adnan's double life with Hae is indicative that he is capable of hiding stuff, not only from his parents, but from the world.

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Jay's story is the biggest piece of evidence the state has against Adnan. A large part of his story is backed by cell tower records and evidence, such as Hae's car.

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Adnan can't remember specifics of that day, which seems suspicious.