Çelebi Bozbıyık, a serving military personnel, was reportedly killed in a military operation launched last week in the northeast of Syria, the Birgün daily reported.
Bozbıyık was reportedly being investigated over alleged links to Turkey’s Gülen group, which is accused of orchestrating a 2016 coup attempt. The group denies any involvement.
Turkey launched its long-planned Operation Peace Spring on Oct. 9 aimed at taking out the Kurdish forces it sees as terrorists but which most of the West views as key partners in the fight against Islamic State in Iraq and the Levant (ISIL) militants.
On Thursday Turkey agreed to a five-day ceasefire in northeast Syria to allow for the withdrawal of Kurdish forces following talks between US Vice President Mike Pence and Turkish President Recep Tayyip Erdoğan.