The Britain-based Syrian Observatory for Human Rights says Rifai Ahmad Taha was killed in a strike Tuesday in Idlib province.
Taha was part of an extremist group that massacred 58 foreign tourists in the ancient Egyptian city of Luxor in 1997. He was also allied with Osama bin Laden in Afghanistan.
In Egypt, a relative said today that Taha's wife and brother have received confirmation about his death. The relative spoke on condition of anonymity fearing reprisals.