The putsch on September 12, 1980 was the bloodiest in Turkey's coup-ridden history, overthrowing a civilian government and putting in place a military junta that ruled Turkey for three years.
Sahinkaya was the last remaining survivor of the coup leaders after the death in May aged 97 of Kenan Evren, the army general who led the junta and served as president from 1980 to 1989.
Sahinkaya died at a military hospital in Istanbul, the official Anatolia news agency said. He passed away after three days on a life support machine.
But only Evren and Sahinkaya were still alive when the case was judged in June 2014. Both were given life sentences but never went to prison because of their poor health.
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The 1980 coup was justified by the military as bringing order to Turkey after a period of social and political chaos.
It was the bloodiest in Turkey's modern history, with 50 people executed while dozens died from torture. Some 600,000 were arrested and many others went missing.
Sahinkaya's death also comes less than one month after the passing of former Turkish prime minister and president Suleyman Demirel, the premier at the time who was ousted by the September 12 coup.
Born in 1925 in the central Anatolian region of Merzifon, Sahinkaya entered a military training college and had been promoted to general by 1977 and was made head of the air force in 1978.
He was one of the most prominent figures on the five-person National Security Council -- the military junta that took power in the wake of the coup.