Am i going to jail?? :(?

ok...so here's the predicament. I was walking in the downtown area at approximately 11:00 pm, and this homeless man asked me for money. It was like the 3rd one that day and i started to get really fed up because I dont have any f**king change! anyway, i pushed him away from me and he hit me in the face. so i pushed him into the wall and i think his head hit the brink and he was knocked unconscious, maybe even dead, but i ran away as soon as i realized he wasnt moving. as i was getting into my car, i think someone wrote down my plates......what should i do?