Who did it?

I can't believe it was the person I thought about. They were really close to me, but I guess not.I just didn't think it would be them and I'm still having nightmares since the incident. You are probably wondering what happened. Well let me tell you from the beginning.
It was the end of the school year and the beginning of summer. My friends and I rented a huge mansion to stay at. There was at least ten of us. We didn't get to the house until 11 pm. We all picked out our rooms and started to unpack and then we slept the night away. Around 2:00 am I heard a scream, so I went to check out what the fuck happened. It sounded like it was three doors down away from me. I opened the door and I froze. One of my good friends Miah was dead. My other friends was already at the room just in a shocked. "Who could've done this to poor Miah" Jasmine said with a sob. "I'm just surprised that we just got here and the murder had made its first move". "I agree Jason,but Miah wouldn't want us to just stand here, she would want us to find out who did this and get revenge" I said. "Audrey is right, cause we can't let the murder get away with this". "Let's all go back to sleep and we can continue to search for the murder because we need all the rest we can get". "Jason is right because if we start now,we would all be to tired to continue". We all said good night to everyone and went back to sleep. Well at least I tried to. I couldn't sleep even if i tried because I kept on remembering all the things that Miah and I did together. Suddenly I heard a knock on the door and i was scared out of my mind. In my head I thought please let it not be the killer. I really don't want to die.