Fukk CNN. Brennan and MI6 knew about the kidnap plan in advance and planted the killer in the team. He was the team member who was killed "in a car crash" a week after returning to the KSA.
"One of the men suspected of killing Jamal Khashoggi reportedly died in a car crash after returning to Saudi Arabia"
https://www.businessinsider.com/khashoggi-suspect-mashal-saad-al-bostani-reportedly-dead-in-car-crash-2018-10