The National News Agency says Mohammed Shaar died today from massive wounds sustained in yesterday's blast, which targeted prominent Lebanese politician Mohammed Chatah.
The 62-year-old Chatah, who was a critic of Syria and its Lebanese ally Hezbollah, also was killed in the explosion.
Officials say Chatah is to be buried at noon tomorrow in the towering Mohammed Al-Amin Mosque in downtown Beirut.
The Lebanese government has declared tomorrow a day of mourning.
