The Istanbul prosecutor's office disclosed the new details in a statement issued soon after the Saudi official, Saud al-Mojeb, flew home after a three-day visit.
Saudi Arabia detained 18 Saudi nationals suspected of being involved in the journalist's murder, maintaining the Kingdom itself would try the suspects and bring them to justice after the investigation was finished.
Saudi Arabia's top prosecutor Saud al-Mojeb left his country's consulate in Istanbul, Tuesday.
Prince Ahmed, the younger brother of King Salman, had been afraid to return, associates of his family said, since he had made public comments last month that appeared to criticise Crown Prince Mohammed bin Salman, 33, the king's favourite son and the de facto ruler of the kingdom.
The U.N. human rights chief says worldwide experts should help investigate the "shockingly brazen" killing of Saudi journalist Jamal Khashoggi and she also is urging Saudi Arabia to reveal the location of Khashoggi's remains.
Turkey wants the suspects to be extradited.
Turkey was quick to place the blame for Khashoggi's disappearance on the Saudi government.
She said she believed the Saudi regime knew where Khashoggi's body was, and called for the "evil criminals and their cowardly political masters" to be held to account.
"The Saudi officials seemed primarily interested in finding out what evidence the Turkish authorities had against the perpetrators".
The Saudis initially claimed that Khashoggi had exited the consulate alive, and expressed apparent concern over his whereabouts.
The Turkish official added that later his body was dismembered in the consulate.
USA officials, including President Donald Trump, have said the country will face consequences over the killing of Khashoggi. His body has not been found. Saudi Arabia has admitted he was killed in what it described as a botched rendition attempt.
Prince Ahmed bin Abdulaziz, a younger brother of King Salman and uncle of Crown Prince Salman, arrived on Tuesday after nearly three months overseas.