heard laughing after shooting the man to death. discovered in dash-cam video taken from the patrol car and the cameras from other responding officers. first we hear him getting a phone call from some one. possibly his wife. >> reporter: in the same call, slager deskrecribes what he say happened. the audio end in static. but not before slager delivers the explanation maybe have found questionable. the dash cameras recorded another conversation. that appears between slager and officer on scene, possibly a supervisor. the sound becomes inaudible. but 41 second later, slager's voice returns. then slager asked the