From Myer's "With Malice": "Considering the timing of the sounds heard in the Dallas police recordings, and the corroborating accounts of three witnesses, the murder of Tippit probably occurred about 90 seconds prior to Benavides' bungled attempts to notify the dispatcher. Therefore, there is good reason to believe that J.D. Tippitt was shot at approximately 1:14:30 p.m."
From William Burrough's WC testimony:
Mr. BALL. And you later saw a struggle in the theatre between a man and some officers, didn't you?
Mr. BURROUGHS. Yes.
Mr. BALL. Did you see that man come in the theatre?
Mr. BURROUGHS. No, sir; I didn't.
And:
Mr. BALL. Did anybody come in there that day? Up to the time of the struggle between the man and the police who didn't have a ticket?
Mr. BURROUGHS. No, sir.
Mr. BALL. Later on the police came in your place?
Mr. BURROUGHS. Yes.
Mr. BALL. They asked you if you had seen a man come in there without a ticket?
Mr. BURROUGHS. Yes.
Mr. BALL. What did you tell him?
Mr. BURROUGHS. I said, "I haven't seen him myself. He might have, but I didn't see him when he came in. He must have sneaked in and run on upstairs before I saw him."
http://mcadams.posc.mu.edu/russ/testimony/burroughs.htm