Ercan Topaca, governor for Turkey's Hatay province, told Turkey's state-run Anadolu Agency that Jamil Raadoun died of his wounds in a hospital Wednesday, hours after a bomb placed beneath his car exploded.
Topaca said the 44-year old Raadoun was a commander of the Suqour al-Ghab brigade, a group affiliated with the opposition Free Syrian Army.
He said an investigation has been launched but added it appeared to be the result of "conflict between Syrian opposition groups."