This report was declassified by Director of National Intelligence (DNI) Haines on 25 February 2021. From the Executive Summary: "We assess that Saudi Arabia's Crown Prince Muhammad bin Salman approved an operation in Istanbul, Turkey to capture or kill Saudi journalist Jamal Khashoggi.  We base this assessment on the Crown Prince's control of decisionmaking in the Kingdom, the direct involvement of a key adviser and members of Muhammad bin Salman's protective detail in the operation, and the Crown Prince's support for using violent measures to silence dissidents abroad, including Khashoggi.  Since 2017, the Crown Prince has had absolute control of the Kingdom's security and intelligence organizations, making it highly unlikely that Saudi officials would have carried out an operation of this nature without the Crown Prince's authorization."
Office of the Director of National Intelligence: https://www.dni.gov/