Mohammed Munir Dolar, was travelling in his vehicle in Kafr Yahmul, a town of Idlib province close to Turkey, when he was shot by security forces, who opened fire on protesters at around 1100GMT, local Syrian opposition sources told AFP on condition of anonymity.
The man was not attending the demonstration, sources said without elaborating.
The Turkish foreign ministry was not immediately able to confirm the information. But the Turkish embassy in Damascus was trying to reach Syrian authorities to get more information after Syrian Orient TV reported that a Turkish citizen had died, a Turkish diplomat said.
A Turkish truck driver has already come under gunfire on Monday in Syria before he returned to Turkey, the diplomat said.
The incidents come as ties between Turkey and Syria are strained after Ankara urged an end to the Syrian authorities' bloody crackdown on protesters and asked President Bashar al-Assad to step down.
Syria on the other hand denounced the infiltration of "terrorists" into Syria from Turkish soil.