But the source said the transcript indicates that he knew nearly immediately after entering that things were amiss, recognising one of the men who meet him inside.
The Saudi journalist, who was a vocal opponent of his country's leadership, was killed as he went to the consulate in Turkey to obtain papers for his forthcoming marriage.
These recordings, MEE reported earlier, have given Turkey a detailed picture of the various operatives, teams and missions issued from Saudi Arabia. In fact, they said, the two men were on first-name terms, calling each other Jared and Mohammed in text messages and phone calls.
It was transcribed and translated into English, which CNN's source read.
The new details were revealed to the U.S. news network by a source who had read the transcript of an audio recording of the Saudi journalist's final moments.
The source describes Khashoggi struggling against a group of people determined to kill him.
Murdered Saudi journalist Jamal Khashoggi's last words were "I can't breathe", according to a new report.
Despite speculation that the powerful crown prince ordered the hit, the kingdom has strongly denied he was involved.
Khashoggi, a Saudi national and USA resident, had gone to the Saudi diplomatic building in Istanbul to pick up papers that would have allowed him to marry his Turkish fiancee.
As this was happening, the alleged perpetrators can be heard telling people nearby to play music to drown out the gruesome sounds.
Responding to a CNN request for a comment on the transcript, a Saudi official told the network that in the version of the transcript and audio recording provided to them by Turkish security channels, there is no "reference or indication of a call being made".
Istanbul's chief prosecutor has filed warrants for the arrest of a top Saudi aide and the deputy head of its foreign intelligence on suspicion of planning Khashoggi's killing, two Turkish officials said last week.
Saudi officials talked to CNN in the wake of the revelation and they dispute any involvement on behalf of the Saudi government. At the same time, he accused the Turkish investigators, lack of cooperation with the Saudi Arabian authorities.
The office of a USA senator who has received a briefing on the investigation by CIA Director Gina Haspel, told CNN that the source's recollections of the transcript are "consistent" with that briefing.
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