Abdülkadir "Demirkan" Pirhasan (13 May 1919 – 29 August 2016), known by his pen name as Vedat Türkali, was a Turkish screenwriter, novelist, playwright, intellectual, teacher and the member of the Democratic People's Party.

[9] His novels, including Bir Gün Tek Başına (One Day Alone) and Mavi Karanlık (Blue Darkness) appears in prominent literary works in modern Turkish literature.

He was detained fifty one times over his controversial writings and political movements carried out with the Communist Party of Turkey.

He was subsequently removed from the job over writing an anonymous novel under "Hüsamettin Gönenli" name criticising the newspaper owner Yunus Nadi Abalıoğlu.

The novel was originally written at his publishing company Gar Publications co-founded by him and a Turkish teacher Rıfat Ilgaz.

[15] Türkali covered 1960 Turkish coup d'état in his first-ever cinematographic novel titled Bir Gün Tek Başına (One Day Alone), which was published in 1974.

Later, he started working secretly outside for Kurdish movement, while Haig Açıkgöz along with his wife Merih established a hideout to escape from arrests.

[9] Türkali was suffering from chronic conditions and was subsequently admitted to Yalova Public Hospital for medical treatment.

His funeral was attended by the numerous people, leading the local police to use tear gas to prevent procession marched from Teşvikiye Mosque to Zincirlikuyu Cemetery.