Answer:
Because Stephanie was dead.
Explanation:
It is a story about a group of friends, Sarah Koenig, Adnan Syed, Jay and Stephanie.
Stephanie was a very close friend of Adnan and she loved Jay. It was January 13th and it was Stephanie's birthday. So Adnan wanted to give a birthday present to Stephanie and also asked if Jay wanted to gift Stephanie a gift or something. Jay agreed to give a gift to her.
According to Adnan, Jay was supposed to go to the mall to buy a present and pick Adnan from the track practice at evening after school. But Stephanie was strangled and according to the police and her phone records, she was strangled in between 2:15 to 2:36 pm after the school, because people have seen her after the school going towards her car.