"Ahmad al-Fliti, who was mediating between fighters and Hezbollah... Was wounded when his car was hit by shelling of unknown origin in Jurud Arsal," ANI said.
"He later succumbed to his wounds."
Lebanon's army said Fliti was killed in shelling by "the terrorist organisation of the Al-Nusra Front", referring to the former Syrian branch of Al-Qaeda.
Hezbollah yesterday said its fighters had begun an operation against militants on both sides of the country's border with Syria.
Funerals were held on Saturday for 11 Hezbollah fighters killed in the clashes, nine in Beirut and two in Baalbek.
Lebanon's army has not officially announced its participation in the offensive, but said yesterday it had targeted "terrorists" in the area.
Thousands of Syrian refugees live in informal camps in Jurud Arsal after having fled the six-year war in their home country.
But security in the area has also long been a concern, with Lebanese forces battling jihadists in the area in 2014.
Hezbollah yesterday also announced fighting on the other side of the border in Syria's Qalamun, where the Lebanese Shiite group has fought for years alongside President Bashar al-Assad's army against rebels and jihadists.
More than a million refugees have flooded into Lebanon since the Syria conflict erupted with anti-government protests in March 2011.
Their presence has been largely tolerated despite testing the limited resources and ageing infrastructure of a country of just four million.
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