File photo of Koc Holding Chairman Mustafa Koc during the opening ceremony of the 14th Istanbul Biennial...
Koc Holding Chairman Mustafa Koc (R) is seen during the opening ceremony of the 14th Istanbul Biennial in Istanbul, Turkey September 2, 2015. Koc, the chairman of Turkish conglomerate Koc Holding and one of the country's most prominent businessmen, has died after suffering a heart attack, a hospital official said on January 21, 2016. Picture taken September 2, 2015. REUTERS/Murad Sezer