The Washington Post, citing people familiar with the matter, reported the CIA concluded bin Salman ordered the killing after the agency examined multiple sources of intelligence, including a phone call that the prince's brother Khalid bin Salman - the Saudi ambassador to the United States - had with Khashoggi.
The reasons for her departure were not clear, but Ms Fontenrose recently travelled to Riyadh to discuss American sanctions imposed against the Saudi officials the U.S. identified as responsible for Khashoggi's death. But Trump has gone out of his way not to blame Saudi Arabia or bin Salman, a close friend of the president's son-in-law Jared Kushner. One Turkish official told Reuters that officials who heard the recordings, which include Khashoggi's killing and conversations leading up to the operation, were horrified but their countries had done nothing.
In the tape, a Saudi hit team allegedly discusses how to execute Khashoggi immediately prior to his arrival at the Saudi Consulate in Istanbul, reports Turkey's Hurriyet newspaper. "Recent reports indicating that the United States government has made a final conclusion are inaccurate", it said.
The Saudi government has denied the claim.
President Donald Trump is under pressure to impose harsh sanctions against the nation for Khashoggi's killing, but he has been slow to respond.
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Khashoggi, a USA resident who was a contributor to The Washington Post, was last seen entering the Saudi consulate in Istanbul on October 2.
It contradicted the explanation made by Saudi officials that the body was rolled up in a carpet and handed to a local collaborator tasked with disposing of the evidence. The Saudi government has denied bin Salman's involvement in Khashoggi's death.
The conclusion will bolster efforts in Congress to further punish the close USA ally for the killing.
"The United States is determined to hold all of those accountable who are responsible for that murder", Mr Pence said on the sidelines of an APEC summit in Papua New Guinea. They added: "We have and continue to hear various theories without seeing the primary basis for these speculations".
"We will be talking with the Central Intelligence Agency later and lots of others".
Intelligence officials have been providing information to Trump about the death for weeks and he was briefed again by phone on Saturday by CIA Director Gina Haspel and Secretary of State Mike Pompeo as he flew to California.
A demonstrator holds a poster with a picture of Saudi journalist Jamal Khashoggi outside the Saudi Arabia consulate in Istanbul, Turkey.