>> reporter: the controversy in north charleston is growing and the trouble spreading to at least one other police officer. the second officer who arrived on the scene is now under intense pressure and there's new audiotape of the officer who fired the fatal shots, michael slager and what you hear him doing has outraged people inside and outside the law enforcement community. in the harrowing moments after walter scott is gunned down police are desperately trying to process the scene. tonight, for the first time we hear the voice of the man who fired the fatal shots. officer michael slager in new dashcam audio, is "apparently heard speaking to a senior officer about what's next. the senior officer advises him to go home wind down. >> go hem, probably a good idea to kind of shut down your thoughts jot down what happened adrenaline quits pumping. >> it's pumping. >> oh yeah oh yeah. >> reporter: slager's apparent laughter is an outrage to one