Mustafa Akyol, a Kurdish politician and the former Ağrı head of the pro-Kurdish Peace and Democracy Party (BDP), reportedly died of cardiac disease early on Monday, the Duvar news portal reported.

According to the report, Akyol who has been given a prison sentence of 13 years, 6 months over his alleged links to the Kurdistan Workers’ Party (PKK), had been held at a prison in the Patnos Prison in Ağrı province since 2011.

PKK is considered by the Turkish government a terrorist organization.

Mr. Akyol reportedly had Parkinson’s and suffered from severe cardiac disease and denied release for months. Last week, he was eventually checked into the Van Yüzüncü Yıl Hospital with a permission from the prison management. He died on Monday in intensive care.

His ody will be returned to his family after an autopsy. A funeral ceremony for him will be held in Manisa province.