Mustafa died in June 1474 of natural causes.[6] It was rumored that Mustafa had approached Mahmud Pasha's wife and thus making him the person behind Mustafa's murder.[7][2] There are speculations that Gülşah Hatun may have been a party to the illicit relations between the prince and wife of Mahmud Pasha.[8] Giovanni Maria Angiolello, a Venetian traveler, author of an important historical report on the Aq Qoyunlu and early Safavid Persia, who was in the service of Mustafa, and who with the rest of Mustafa’s household accompanied the prince’s cortege from his post his Kayseri to Bursa, where he was buried, denied any role for Mahmud Pasha in Mustafa's death;[7][9][2] nevertheless Mehmed II had the man executed shortly thereafter.[10]