Consequences for a bike rider if pillion dies in road accident

i am a male behind me was sitting another male and behind her was a female and we were sitting on my bike. we were not wearing helmet. the (police) bus ran into us and due to that the girl lost her life. the bus hit us and ran away .i have given my statement to the police .after that statement the police took me to cctv room to see the bus no. but it didn't show up on camera it was blur.after 1 1/2 years there is a summon for me from the court as witness. i don't know who launched the complain, if the girls parents have launched the complaint against the bus driver or its insurance company or me. what should i do . will someone try to blame me for the incident or put a case that it was my mistake . since i wasn't at mistake i was as corner of road as possible, will they blame me for it. i overtake the bus and was ahead of it then later it gained speed and hit me. hearing is tommorrow morning.