While Israel is denying any involvement, I can't imagine their own terror legend being taken out by Arabs. In any case, he is dead and gone. Below is his resume courtesy of CT Blog. He is responsible for the 1983 Beirut bombing, the 2006 ambush of Israeli soldiers (9 killed) and subsequent capture of Ehud Goldwasser and Eldad Regev, as well as the 1994 bombing of the Jewish center in Beunos Aires, Argentina.
A car bomb in Damascus killed Imad Mughniyeh, leader of Hezbollah's military operations and a mass murderer. It was a fitting end for someone who planned and executed numerous deadly terrorist attacks, including the 1983 bombings of the U.S Embassy and Marine barracks in Beirut and the 1994 bombing of the Buenos Aires, Argentina Jewish center. Mugniyah was indicted in the U.S. for his role in planning and executing the 1985, hijacking of TWA Flight 847, which resulted in the murder of one U.S. citizen.
Mughniyeh was also implicated in Hezbollah's kidnapping of two Israeli soldiers in 2006, which led to Israel's incursion into Lebanon. Contributing Experts posted several analyses at that time about his role in that conflict, including:
"Imad Mugniyah likely behind the capture of Israeli soldiers," by Bill Roggio, July 12: "The sophistication of this attack indicates Imad Fayez Mugniyah, Hezbollah's chief of military operations was directly involved. Mugniyah has a long history of successful military and terrorist operations across the globe. Mugniyah has a history of conducting similar snatch and grab operations against the Israelis."
"Inside Hizballah’s decision-making," by Magnus Ranstorp, July 14: "The file for handling special operations of this kind is usually left to Imad Mughniyeh, the elusive terrorist mastermind for Hizballah, who stands with one foot within Hizballah (reporting to Naserallah directly) and with one foot in Iran inside the architectures of the Iranian Ministry of Intelligence and Security (MOIS) and the al-Qods unit within the Iranian Pasdaran.
Other CT Blog posts on Mughniyeh: Aaron Mannes posted last October on the history of "Force 17," the Palestinian terrorist group once led by Mughniyah, and which served as an early inspiration to Bin Laden. Olivier Guitta posted in June 2006 on a Syrian plot, led by Mughniyeh, to destabilize Qatar.