The fiancee of murdered Saudi journalist Jamal Khashoggi described the sentencing of five people to death in relation to the killing as unfair and invalid, adding that their execution would further conceal the truth.

Jamal Khashoggi fiancee
Hatice Cengiz, Khashoggi's fiancee, was waiting outside the consulate when he went inside to retrieve the documents.Twitter

Five people have been sentenced to death in Saudi Arabia for the killing of journalist Jamal Khashoggi in Istanbul last year. Khashoggi disappeared after going to the Saudi consulate in Istanbul on October 2, 2018, to obtain documents for his planned wedding. His body was reportedly dismembered and removed from the building and his remains have not been found.

A UN investigator accused Riyadh of making a "mockery" of justice by exonerating senior figures who may have ordered the killing.

The presiding Saudi court rejected the findings of a UN inquiry by ruling that the killing was not premeditated, rather carried out "at the spur of the moment".

Hatice Cengiz, Khashoggi's fiancee, was waiting outside the consulate when he went inside to retrieve the documents.

In a statement on Tuesday, Cengiz said the trial did not reveal why those convicted had killed Khashoggi because the trial was held behind closed doors.

"If these people are executed without any chance to speak or explain themselves, we might never know the truth behind this murder," she said.

"I'm calling upon every authority in the world to condemn this kind of court decision and urgently prevent any execution, because this would just be another step in concealing the truth."

'SHAM TRIAL'

Turkey said on Monday the trial outcome fell far short of serving justice, and on Tuesday Turkish Communications Director Fahrettin Altun slammed the verdict as an "insult to the intelligence of any fair observer".

"The international media must pursue the case of Khashoggi until there is true accountability... Those responsible must face justice sooner or later," Altun said on Twitter, calling the case a "sham trial".

"This despicable murder was done at a diplomatic facility against every diplomatic norm imaginable! We will follow this case to the end regardless (of) how high it goes."

The murder of Khashoggi, a US resident and critic of the kingdom's de facto ruler Crown Prince Mohammed bin Salman, caused a global outcry, and some Western governments, as well as the CIA, said they believed the prince ordered the killing.

Saudi officials say he had no role, though in September the crown prince indicated some personal accountability, saying "it happened under my watch".

After Monday's verdict, a source familiar with US intelligence assessments said key US government agencies rejected the validity of the court proceedings and CIA experts still believed Prince Mohammad personally ordered, or at least approved of, the killing.

11 unnamed individuals indicted in the case

Saudi Arabia has said Khashoggi was killed in a "rogue operation" and put 11 defendants, all of whom are Saudi nationals, on trial earlier this year. Of the 11 unnamed individuals indicted in the murder case, five were sentenced to death, three face jail terms totalling 24 years, and the others were acquitted.

(With inputs from Reuters)