The killing of Masri, described by analysts as "jihadi royalty," could serve as a major security coup for US President Donald Trump early on his presidency.
Two branches of the global jihadist group, including the powerful Al-Qaeda in the Arabian Peninsula (AQAP), announced Masri's death in a statement dated yesterday.
Calling him a "hero," the statement said Masri "was killed during a Crusader drone strike" in Syria.
"All of al-Sham (Syria) will bear witness to the latest crime of America and the Crusader alliance," the statement said, in reference to the US-led coalition bombing jihadists in Syria and Iraq.
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A US official said this week that Washington was investigating reports that Masri had been killed in a US strike in or around the city of Idlib in northwest Syria.
The US has escalated its bombing campaign of the province, mostly ruled by Al-Qaeda's former Syrian branch, now known as Fateh al-Sham Front.
In early February, the Pentagon said it killed 11 Al-Qaeda operatives there.
Masri is a son-in-law of Qaeda founder Osama bin Laden and is believed to be Zawahiri's deputy.
Masri, also known as Abdullah Muhammad Rajab Abdulrahman, joined Zawahiri in the Egyptian Islamic Jihad group in the 1980s before they enlisted with Bin Laden in the 1990s.
He was detained with several other Al-Qaeda figures in 2003 in Iran and held until 2015, when they were traded for the release of an Iranian diplomat who had been seized by Al-Qaeda's Yemen branch.
Charles Lister of the Middle East Institute described al-Masri as "jihadi royalty," as a longstanding member of Al-Qaeda's central Shura Council and "one of Ayman al-Zawahiri's closest long-time confidants.
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