Alive but dead

My name is Luke price, I'm 18 years old, and I go to school and get great grades! I have a big secret though, on August 15, 2018, I died, I was killed and thrown into a river, how I came back to life I will never know. All I do know is I'm alive right now, my only purpose is to find the man that killed me. now, I don't go to school, instead, I got myself a job, a roommate, and my only mission is to find that man, and do to him what he did to me.