This was the first record of a fatal event in seven days of protests across the country.
Reports said Abdullah Cömert was demonstrating to show support for a wider protest that began in İstanbul last week against the policies of Prime Minister Recep Tayyip Erdoğan. Cömert was shot in the head, according to reports.
It was not immediately clear who opened fire at the Hatay rally, the governor’s office statement said, adding that officials had launched an investigation into the incident.
Cömert was a member of the main opposition Republican People’s Party’s (CHP) youth branch, private NTV television reported, citing a CHP lawmaker from Hatay.