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
the calm, is a reas the calm serene morning and the lives of those in the d.a. s office would be shattered. i heard what i thought was gunshots. reporter: he and his partner were investigating a burglary when something big caught his attention. and it was just a slow and methodical, five shots. bam, bam, bam, bam, bam. and then, it was a little pause, i guess, you would say, and then three more shots after that. reporter: shannon was inside the courthouse when she heard the sound of sirens. it s not unusual, there s a police station a block away. there s a hospital a few blocks down the street. reporter: that siren was jason stasny s squad car. i said, those are gunshots we need to go. so we packed up and went.
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