independent review. there are questions about the medical examiner tonight. reporter: on the run from police in florida marlon brown never expected this is how his life would end. in an instant he s gone. brown disappears underneath the officer s patrol car. the officer had been chasing him for a seat belt violation. brown s family calls it an execution saying officer james harris never slowed down or swerved to avoid hitting brown. that s not what the medical examiner for the county found. in this autopsy report, dr. shipping bow called the death in may an accident. most controversially that the car did not, repeat did not hit brown. because there were no pelvic or skull fractures. instead the medical examiner found brown died from mechanical