Jailed air force colonel Adnan Çetin suffered a cerebral bleeding in Istanbul’s Silivri prison and was taken to hospital where he was later declared dead, according to his lawyer Kemal Ucar.

In a series of tweets on Feb 16, Ucar wrote that his client, under arrest over coup charges, suffered brain hemorrhage and was subsequently taken to Bakirkoy Sadi Konuk Research Hospital.

“Family members are not let into the hospital room as he is formally under arrest. Soldiers are waiting outside the door,” Ucar said.

The lawyer said Feb 24 that Çetin died at the hospital.

Jailed as part of an investigation into the July 15, 2016 failed coup, Cetin was going to appear before the court for the first time on Apr 16, this year, according to his lawyer.