What father is a victim of a violent crime, what do we do?

My father is a victim of a violent crime and I would like to know what to do to help him get the compensation he deserves. He was knocked down with no purpose by a man that worked in that area but he escaped before the police got there. My father is in a very critical state. The police only collected reports from witness and that's it, they didn't even go and try to find out who the suspect was. We know where he works and we also know that the workers/ owners of the place where he works helped him escaped. So please help me out I need it very much. Thank you so much for your time.