Mr. Specter. With relationship to that first noise that you have described, when did you hear the voice?
Mr. Kellerman. His voice?
Mr. Specter. We will start with his voice.
Mr. Kellerman. OK. From the noise of which I was in the process of turning to determine where it was or what it was, it carried on right then. Why I am so positive, gentlemen, that it was his voice—there is only one man in that back seat that was from Boston, and the accents carried very clearly.
Mr. Specter. Well, had you become familiar with the President's voice prior to that day?
Mr. Kellerman. Yes; very much so.
Mr. Specter. And what was the basis for your becoming familiar with his voice prior to that day?
Mr. Kellerman. I had been with him for 3 years.
Mr. Specter. And had you talked with him on a very frequent basis during the course of that association?
Mr. Kellerman. He was a very free man to talk to; yes. He knew most all the men, most everybody who worked in the White House as well as everywhere, and he would call you.