tried to help mark. and stasny was taking over. >> it's a scene, it's nothing that you can prepare for. >> reporter: he knew right away, it was bad. >> he looked at me and he stopped breathing. that's when i started cpr. i got him to take seven breaths. i do remember that. >> reporter: as his car cam was rolling, his body mic caught the pleas for mark to hold on just a little longer. >> ems is almost here, the ambulance is coming. >> i tried my best to you know, to tell him. you know, you are doing good, keep breathing the ambulancine coming. >> reporter: the ambulance rolled up after five agonizing minutes. back at the courthouse shannon