In statements to the Ergenekon trials in 2012, he said that he became a PKK sympathizer in 1979, and joined after the 1980 Turkish coup d'état as a way of leaving the country after a dispute with his father in which he shot and wounded him. His brother Sırrı Sakık is a member of Parliament for the BDP.
1993 ambush
Sakık later claimed that military commanders were aware of his planned May 24, 1993 PKK ambush, and deliberately left the soldiers unarmed and unguarded. He identified a group within the military called the East Study Group, saying it had used the ambush as part of its coup plans. Abdullah Öcalan claims Sakık ordered the 1993 ambush as part of an Ergenekon attempt to sabotage the peace process then ongoing between the PKK and the Turkish government, saying that Sakık had been used by Ergenekon.
Defection and capture
In 1998 he was ordered by Öcalan to lead the PKK in the Hatay province, an area not suitable for PKK guerrilla warfare as it was in a leveled environment. He therefore refused to enter deeply into the province and stayed with his troops just at the border. Öcalan then called him back to Damascus, and as he refused to obey his orders, later sent him into detention to the Gare camp in the Dohuk Governorate, Iraqi Kurdistan. From there he escaped and was received by Masoud Barzani who provided him protection. But the Turkish armed forces were made aware of his presence in the region, and captured him on the 13 April 1998. Some sources said that the 1998 Operation Murat, launched shortly after Sakık's capture, was based in part on information obtained from Sakık. He was sentenced to death for the killing of 125 members of the security forces and 121 civilians, but the sentence was commuted to life imprisonment after Turkey abolished the death penalty.
Ergenekon testimony
He was first a secret witness in the Ergenekon Trials until giving up on his anonymity voluntarily. The military leaders prosecuted in the trials were opposed to the fact that a former PKK leader would testify against them. Sakık says that Iran took back weapons it had provided to the PKK after the PKK declared a ceasefire in 1993. He said that Veli Küçük gave training to PKK militants. He also claimed that the PKK had prior notice of the 1980 coup. Sakık has written a book about supposed PKK's executions of internal dissidents - people who challenged the leadership or later renounced violence - which he says amounts to about 2000 people. Former Secretary-General of the National Security CouncilTuncer Kılınç has been reported as saying that Sakık's word could be trusted.
Books
Apo, Şark Yayınları, 2005.
Şemdin Sakık anlatıyor : Kobralar üzerimize gelince aklımızı kaçırıyorduk / Tuncer Günay, Doğan Kitap 2007.
Eski Bir Militanın Kaleminden Şiddetin Sefaleti, Lagin Yayınları / Araştırma-İnceleme Dizisi 2010
İhanetin Tarihi, Yakın Plan Yayınları / Türkiye Siyaseti Dizisi 2010
İmralı'da Bir Tiran: Abdullah Öcalan, Togan Yayıncılık 2012