The news that the Muezzin Osman Aslan died suddenly from a heart attack on Sunday, 2 August 2020, in Hagia Sophia, caused a sensation.
He passed away some days after Hagia Sophia was converted into a mosque and a Muslim prayer was held there, after many decades. This particular mouezzin was a volunteer in Hagia Sophia and was calling on people from the minarets to pray in Hagia Sophia.