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Hae had written Adnan a letter. Apparently Adnan had not respected her decision and had not left her alone regarding her new relationship.

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Hae broke Adnan's heart. It's possible that he felt enraged and wanted to get revenge on her for embarrassing him and causing so much turmoil in his family life.

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Adnan and Jay were both over at "Cathy's" house after track, and Cathy noticed Adnan being slumped over and acting strange. Then, while at her house, Adnan gets a call and becomes concerned about what to say and do.

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A palm print from Adnan had been found on a map book taken from Hae's car, and the page of Leakin Park had been removed along with others.

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Adnan and his friend Aisha had been talking on a note in class, and later Aisha is shown the note where it says "I'm going to kill" written in pen. This means that it was written later because Aisha and Adnan had originally been using pencil.

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Adnan had his phone after track practice was over. Later in the evening, two calls from most likely in Leakin Park (where Hae was buried) ping off the cell towers in the park.