An alleged spy for the United Arab Emirates (UAE) being investigated for possible links to the killing of journalist Jamal Khashoggi was found dead in his Turkish jail cell, The Wall Street Journal reported Monday.

Turkish prosecutors on Monday said wardens had found the suspect, Zaki Y.M. Hassan, hanged inside his solitary cell in Istanbul’s Silivri prison, according to the newspaper, which added that prosecutors are calling for an investigation into the death.

Turkish authorities were reportedly investigating Hassan and another alleged UAE spy in connection with Khashoggi's killing in the Saudi consulate in Istanbul in October.

ADVERTISEMENT

The two came to Turkey soon after the Oct. 2 killing, according to the Journal.

They were detained on April 15 and reportedly have since admitted to spying for the UAE.

Saudi Arabia has charged 11 people in the death of Khashoggi, a Saudi dissident and Washington Post columnist.

U.S. intelligence services have blamed Saudi Crown Prince Mohammed bin Salman, who was not one of the 11 charged, for ordering the killing.