well, tonight the circumstances involving the death of a georgia teenager have grown murkier. what happened to 17-year-old kendrick johnson? was it an accident or was it murder? the answer to those questions depends on who you ask. he was a star athlete at his high school in georgia. in january his body was found inside a rolled up gym mat. an autopsy said the death was an accident but his parents didn't buy it and ordered their own independent examination. as we reported two days ago, that autopsy concluded johnson died of blunt force trama. victor blackwell speaks exclusively with his parents and the pathologist who considers his death a homicide. >> reporter: kenneth and jackelyn johnson says science supports what they thought all along, that their 17-year-old son kendrick was murdered at his high school in georgia.