"In accordance with plans made in advance, the victim, Jamal Khashoggi, was choked to death immediately after entering the Consulate General of Saudi Arabia in Istanbul on October 2", the Turkish prosecutor's office said.
He was killed after entering the kingdom's consulate in Istanbul on October 2 to obtain paperwork for his marriage to his Turkish fiancee.
United Nations High Commissioner for Human Rights, Michelle Bachelet, has called for global experts to be involved in an independent investigation into the murder of prominent Saudi dissident journalist Jamal Khashoggi, who went missing after visiting the kingdom's consulate in Turkey's largest city of Istanbul earlier this month.
The woman, who is a Turkish citizen, called police when Khashoggi did not emerge at 5 p.m., after the consulate had officially closed.
Turkish officials have concluded a team of 15 Saudi agents was involved in the killing of Jamal Khashoggi at the Saudi Arabia Consulate (pictured) in Istanbul.
Earlier in the day, he met Istanbul chief prosecutor Irfan Fidan for the second time.
The Saudi chief prosecutor, Saud al-Mujeb, left for the airport and was scheduled to return to Saudi Arabia.
The head of the Saudi investigation, Attorney General Sheikh Saud al-Mojeb, last week acknowledged that the killing was "premeditated", based on Turkish evidence.
Turkey has suggested Saudi agents murdered Khashoggi under the orders of the ruling royal family.
US President Donald Trump has said that he does not think the Saudis have betrayed him on the issue of the late Jamal Khashoggi.
Later, Riyadh said the killing was premeditated and Prince Mohammed has vowed that the killers would be brought to justice.
Cengiz described Khashoggi as a "martyr for a cause" and said she hoped his body would be returned soon so his loved ones could bury him. "After being strangled, [Khashoggi's body] was subsequently destroyed by being dismembered, once again confirming the planning of the murder".
In a written response, Mojeb invited Fidan to Saudi Arabia to question the suspects and determine "the fate of the body" and establish whether the killing was premeditated, the Turkish prosecutor's statement said.
The kingdom has come under intensifying worldwide pressure as Turkey accuses it of failing to cooperate in a probe over the disappearance of Khashoggi, a columnist for the Washington Post who sought exile in the United States past year.
He said a ceasefire should take effect within 30 days.
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