I couldn't get the audio to work for me.  But, you may have better luck.

Memories of JFK assassination haunt former Secret Service agent and North Dakota native (with audio)

Three members of the Secret Service detail who guarded President Kennedy the day of his assassination leave during a break in the investigation of the slaying by a presidential commission March 9,1964, in Washington. From left are Clint Hill, who was in the car following the president; Roy H. Kellerman, who was in the right front seat of the presidential limousine; and William R. Greer, who drove the Kennedy car. Associated Press