The trial of 20 Saudi nationals charged with the murder of Jamal Khashoggi opened in an Istanbul courtroom on Friday, and his fiancée hopes the case will offer new clues to the whereabouts of the dissident journalist's remains. The journalist's 2018 killing at the consulate sparked worldwide condemnation and cast a cloud of suspicion over the prince.
The trial will be closely watched for possible new information or evidence to the killing, like the whereabouts of Mr Khashoggi's remains.
He visited the Saudi consulate in Istanbul on 2 October 2018 to collect paperwork for his upcoming marriage to Cengiz, but never emerged from the building. He never walked out.
"Justice in these complex environments is not delivered overnight.but a good process here can build up (evidence for) what can happen in five years, in 10 years, whenever the circumstances are stronger", Callamard said.
The prosecutor is seeking aggravated life sentences for all, the harshest term in Turkey since it abolished the death penalty in 2002.
The indictment accuses two top Saudi officials, former deputy head of Saudi Arabia's general intelligence Ahmed al-Asiri and former royal court adviser Saud al-Qahtani, of instigating "premeditated murder with monstrous intent".
Some 18 other suspects - including intelligence operative Maher Mutreb who frequently travelled 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". Both men, part of the Crown Prince's inner circle, were relieved of their duties immediately after Khashoggi's murder. Those being tried include two close aides of Crown Prince Mohammed Bin Salman. Turkish officials say his body was dismembered and removed to an unknown site. Turkey, a rival of Saudi Arabia, apparently had the Saudi Consulate bugged and has shared audio of the killing with the CIA, among other agencies.
Khashoggi, a Washington Post columnist, who had grown increasingly critical of the crown prince.
Khashoggi's gruesome killing stunned Saudi Arabia's western allies, plunging the kingdom into its worst diplomatic crisis since the 9/11 attacks. As worldwide pressure mounted because of the Turkish leaks, the kingdom sooner or later settled on the explanation he was killed by rogue officials in a brawl.
Riyadh had insisted that the kingdom's courts are the correct place for the suspects to be tried and put 11 people on trial over the killing.
In December, five of the people were sentenced to death while three others were found guilty of covering up the crime and were sentenced to a combined 24 years in prison.