Retired Col. Tarık Akça was found dead in his office on Fevzi Çakmak Street on Monday night when area residents called the police after hearing gunshots at the office.
Akça, a retired air force commander, was 50. His body was taken to the Council of Forensic Medicine for a post-mortem examination. Police have launched an investigation into his death.
Sledgehammer is a suspected coup plan devised at a military gathering in 2003 that allegedly sought to undermine the government in order to lay the groundwork for a coup d'état.