Hatice Cengiz, who was engaged to slain Saudi journalist Jamal Kashoggi, leaves a court in Istanbul on Friday. Two former aides to Saudi Crown Prince Mohammed bin Salman and 18 other Saudi nationals are on trial in absentia over the 2018 killing of the&nb

Twenty Saudi suspects including two former aides to Crown Prince Mohammed bin Salman went on trial in absentia in Turkey on Friday, accused of killing and dismembering journalist Jamal Khashoggi in 2018.

Iran PressAsia: Khashoggi, 59, was an insider-turned-critic who was killed inside the Saudi consulate in Istanbul on October 2, 2018, where he had gone to obtain documents for his wedding to Turkish fiancee Hatice Cengiz, Turkish media outlets reported.

Turkish prosecutors claim Saudi Deputy Intelligence Chief Ahmed al-Assiri and the royal court's media czar Saud al-Qahtani led the operation and gave orders to a Saudi hit team.

Hatice Cengiz, who was engaged to slain Saudi journalist Jamal Kashoggi, leaves a court in Istanbul on Friday. Two former aides to Saudi Crown Prince Mohammed bin Salman and 18 other Saudi nationals are on trial in absentia over the 2018 killing of the Washington Post columnist. (AP)

Eighteen other suspects, including intelligence operative Maher Mutreb who frequently traveled with the Crown Prince on foreign tours, forensic expert Salah al-Tubaigy and Fahad al-Balawi, a member of the Saudi royal guard, were charged with "deliberately and monstrously killing, causing torment".

The prosecutor has already issued arrest warrants for the suspects who are not in Turkey, so they face life terms without the likelihood of ever serving any conviction.

Cengiz, who is a complainant in the case, was attending the trial alongside the UN Special Rapporteur on the Extrajudicial, Summary, or Arbitrary Executions, Agnes Callamard.

Yasin Aktay, a close friend of Khashoggi and advisor to Turkish President Recep Tayyip Erdogan's ruling party, was also in the courtroom.

Erdogan has said the order to murder Khashoggi came from "the highest levels" of the Saudi government but has never directly blamed Prince Mohammed.

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Hatice Cengiz, who was engaged to slain Saudi journalist Jamal Kashoggi, leaves a court in Istanbul on Friday. Two former aides to Saudi Crown Prince Mohammed bin Salman and 18 other Saudi nationals are on trial in absentia over the 2018 killing of the&nb
A vigil in Istanbul in October 2018 for the Saudi columnist Jamal Khashoggi, who was killed that month in the Saudi Consulate in the city. (AFP)