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Adnan had motive to kill Hae because he was possessive during their relationship and angry that Hae already had a new boyfriend.

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Adnan had a very poor memory of the day and could not provide an alibi from that day.

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Jay states Adnan borrowed 2 shovels from him and says he helped Adnan bury Hae's body.

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In Hae's diary it states that Adnan was frustrated with her from the breakup.

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The police receive an anonymous phone call saying they should look at the ex boyfriend, AKA Adnan.

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At the top of a page in Hae's diary, Adnan wrote "I'm going to kill".