One of two men arrested two weeks ago by Turkey on suspicion of espionage for the United Arab Emirates has been killed in prison, prosecutors say.
The suspect identified as Zaki Hasan was found suspended in his cell in Silivri Prison, west of Istanbul, on Sunday.
He allegedly confessed during the interrogation that he and the other suspect had been spying on Arab dissidents.
Turkish officials said they also investigated possible links to the murder of Saudi journalist Jamal Khashoggi.
A UN Special Rapporteur said he was "the victim of a brutal and deliberate murder, planned and committed by officials of the State of Saudi Arabia", but the Saudi government has insisted that it is a "rogue operation" ,
The United Arab Emirates are Saudi Arabia's closest ally, but b There is no evidence that he was involved in Khashoggi's death.
The two men detained in Turkey on April 15 were charged four days later for "political, military and international espionage" after allegedly ridiculing spied exiled dissidents and students for the United Arab Emirates.
At the time of their detention Turkish officials said one of the two suspects arrived in Turkey just days after Khashoggi's assassination. The other suspect came later to assist his colleague, the officials added.
The men were later identified as Palestinians by TRT Arabic, a subsidiary of the Turkish radio station. It is said that Mr. Hasan is a 55-year-old retired high-ranking Palestinian intelligence official.
The Istanbul Attorney's office said in a statement that Mr. Hasan was found by prison guards hung on a bathroom door in his cell eating on Sunday morning.
A preliminary investigation has been initiated and an autopsy performed, she added.
The United Arab Emirates have so far expressed no opinion on the death of Hasan or his arrest.