Ömer Halisdemir was a Turkish non-commissioned officer, who was killed on duty in the night of failed 2016 Turkish coup d'état attempt, immediately after he shot dead pro-coup general Semih Terzi and prevented the capture of the headquarters of the Special Forces Command in Ankara by the rebel forces.

[2][3][4] In 1999, Ömer Halisdemir joined the Turkish Armed Forces as a non-commissioned officer of the infantry.

He served in southeastern Turkey in Şırnak, Silopi and also outside the country in Northern Iraq and Afghanistan.

Gen. Terzi and ten heavily armed troops and officers escorting him, who flew in from a military base in Diyarbakır, landed with a helicopter outside the headquarters around 02:16 local time on 16 July.

Major Fatih Şahin immediately responded with a barrage of fifteen rounds of gunfire, hitting Halisdemir twelve times in the back.

As Lieutenant Mihrali Atmaca noticed that Halisdemir was still alive, he shot him once more, this time fatally.

"[10] The coup attempt failed nationwide as the rebels were met with a fierce resistance from the public, police and loyalist military.

The pro-coup military personnel, who tried to capture the Special Forces Command and killed Sgt.

[1][2] A monument to commemorate Halisdemir and his bravery was erected in the front yard of the Special Forces Command headquarters, where he was killed, next to a spot which contains his preserved blood stain.

[11] A public outpouring of sympathy has met Halisdemir, whose grave is visited by a great number of people who come to pay their respects.