(CNN) -- Abu Yahya al-Libi, al Qaeda's No. 2 man, was killed in Pakistan on Monday, according to U.S. officials. 

Al-Libi's death was "another serious blow to core al Qaeda," White House spokesman Jay Carney said. 

Al-Libi, 49, was a well-regarded figure in jihadist circles and had emerged as one of the terrorist network's most important clerics and propagandists, appearing in countless videos in recent years. 

He was killed by a CIA drone strike, according to U.S. officials. Drone strikes remain a highly contentious issue between the United States and Pakistan. 

Who is Abu Yahya al-Libi? 

By most accounts, al-Libi was effectively al Qaeda's deputy leader. 

A Libyan citizen and an Islamic scholar, al-Libi bolstered his credibility within jihad groups after escaping from U.S. custody in Afghanistan in 2005. 

He became the public face of al Qaeda and used his religious training to justify the organization's actions. As one of the group's chief ideologues and propagandists, al-Libi appeared in numerous recruitment videos in which he cast himself as a sheikh with the legitimacy to issue fatwas. 

Other than his appearances in propaganda videos, it's unclear which plots against the West al-Libi was involved in. A wanted ad from the U.S. State Department described him as a "key motivator in the global jihadi movement," and said that "his messages convey a clear threat to U.S. persons or property worldwide." 

What does his death mean for al Qaeda? 

This is a "very serious blow" to al Qaeda, according to Noman Benotman, a former senior member of the Libyan Islamic Fighting Group who spent significant time with al-Libi in the 1990s. No one else within the group rivals his legitimacy as a religious scholar nor has the credibility in the Arab world to provide Islamic justifications for al Qaeda's global campaign of terrorism, he said. 
WHO WAS KILLED?
WHERE?
WHAT DAY?
WHAT RADICAL GROUP WAS HE A PART OF?
HOW OLD WAS HE?
WHAT CIRCLE WAS HE A WELL REGARDED FIGURE OF?
HOW WAS HE KILLED?
WHO IS GIVING THIS INFORMATION?
BETWEEN WHAT TWO COUNTRIES DO DRONE STRIKES REMAIN A HIGHLY CONTENTIOUS ISSUE?
WHAT DID AL-LIBI DO FOR AL QAEDA/
WHERE WAS HE A CITIZEN FROM?
WHERE DID HE ESCAPE FROM IN 2005?
WHAT DID HE USE TO JUSTIFY ORGANIZATION'S ACTIONS?
WHAT TYPE OF VIDEOS DID HE OFTEN APPEAR IN?
HOW DID A WANTED AD FROM THE US STATE DEPARTMENT DESCRIBE HIM AS?
HOW DID THE US CONSIDER HIS MESSAGES?
WHAT DOES HIS DEATH MEAN FOR AL QAEDA?
WHO SAID THAT?
WHO IS HE?
DID HE KNOW HIM PERSONALLY?
HOW DID THEY KNOW EACH OTHER?
WHAT YEAR DID THAT HAPPEN?
WHO IS SPOKESMAN OF WHITE HOUSE THAT TALKED ABOUT AL LIBI?
WHAT TYPE OF SCHOLAR WAS AL LIBI?
WHAT WOULD AL LIBI CAST HIMSELF AS IN HIS VIDEOS?
WHAT PLOTS IN THE WEST WERE BEING WORKED ON BY HIM?
WHAT POSITION DID HE HAVE IN THE AL QAEDA?
Abu Yahya al-Libi
Abu Yahya al-Libi, al Qaeda's No. 2 man, was killed
Pakistan
killed in Pakistan
Monday
killed in Pakistan on Monday
al Qaeda's
Abu Yahya al-Libi, al Qaeda's No. 2 man
49
Al-Libi, 49
jihadist circles
well-regarded figure in jihadist circles 
CIA drone strike
killed by a CIA drone strike
U.S. officials
 according to U.S. officials
United States and Pakistan
Drone strikes remain a highly contentious issue between the United States and Pakistan
al Qaeda's deputy leader
effectively al Qaeda's deputy leader
Libyan citizen
Libyan citizen
U.S. custody in Afghanistan
escaping from U.S. custody in Afghanistan in 2005.
religious training
used his religious training to justify the organization's actions
ecruitment videos
appeared in numerous recruitment videos
"key motivator in the global jihadi movement,
wanted ad from the U.S. State Department described him as a "key motivator in the global jihadi movement,
a clear threat
his messages convey a clear threat to U.S. persons or property worldwide." 
very serious blow" to al Qaeda
his is a "very serious blow" to al Qaeda
Noman Benotman
"very serious blow" to al Qaeda, according to Noman Benotman
former senior member of the Libyan Islamic Fighting Group
according to Noman Benotman, a former senior member of the Libyan Islamic Fighting Group
YES
spent significant time with al-Libi in the 1990s
spent significant time with al-Libi
spent significant time with al-Libi
1990s
spent significant time with al-Libi in the 1990s
Jay Carney
"another serious blow to core al Qaeda," White House spokesman Jay Carney said. 
Islamic scholar
Libyan citizen and an Islamic scholar
sheikh with the legitimacy to issue fatwas
he cast himself as a sheikh with the legitimacy to issue fatwas
it's unclear
it's unclear which plots against the West al-Libi was involved in
al Qaeda's No. 2 man
Abu Yahya al-Libi, al Qaeda's No. 2 man