UN extrajudicial executions investigator Agnes Callamard has said in a report that the evidence suggests Salman and other high-level officials are individually liable for the killing of Khashoggi.
The report has said that the evidence merits further investigation by an independent and impartial international inquiry, the BBC reported.
The Saudi based journalist who used to write columns for the Washington Post was killed inside the Saudi consulate on Istanbul in October 2018.
The murder caused international outrage and provoked condemnation of the 33-year-old Crown Prince, also known as "MBS". Saudi authorities, however, insist they were not acting on the Crown Prince's orders.
A former royal family insider turned critic of the Saudi crown prince, Khashoggi, 59, disappeared after he entered the Saudi consulate in Istanbul on October 2 to collect a document for his upcoming marriage. The case has shone the spotlight on the crown prince, who is now accused of having ordered Khashoggi's murder - a claim Riyadh denies