. >> narrator: officer j.d. tippit had been patrolling in oak cliff when he was gunned down, killed instantly next to his car. of the seven eyewitnesses to the shooting, the one with probably the clearest view was jack tatum. >> i was preparing to turn left on 10th street from denver. i noticed an individual walking in my direction with a light, zippered jacket on, darker pants, and a squad car pulling over to the curb next to him. as i approached the squad car, i noticed that the individual was leaning over, talking to the officer. he had both hands in the pockets of his jacket. i continued through the intersection, and about in the middle of the intersection, i heard three, maybe four shots. >> narrator: researcher dale myers investigated the tippit shooting. >> the killer gets to about this position on the sidewalk, and tippit's patrol car pulls to the curb and either calls him over to the curb or the man comes ovhi by himself and leans through the window and talks to tippit through the vent window for 10 or 20 seco