a woman is describing an apparent problem with his legs. >> his leg is broke, you're dragging him like that. >> reporter: he's taken to a hospital where he went into a coma and then he dies a week later. question number one is how long it took to get this man medical attention. the city's mayor pledged a full investigation. >> according to the time line as we know it took around 30 minutes. >> reporter: he question number two, what precisely caused gray's death? his family's attorney described severe trauma and he's raising the issue of excessive force. >> he was in good health when the police first contacted him, and he died of an 80% severed spinal cord and three broken vertebrae in his neck. >> reporter: court documents filed in the case say gray was arrested without incident after an officer noticed a knife clipped to his pants. he was charged with having a switch blade. the family's attorney says the