Zawahri belongs to an upper middle class family of doctors and scholars in Egypt.
No information regarding how Ayman al-Zawahri was selected was given by the terror group al-Qaeda. But they insisted that this was the best way they could pay a tribute to their "martyrs".
"Today, praise God, America is not facing an individual, a group or a faction," Zawahri had said in a video tape in May forewarning America that it faced threat not only from terror groups but from Muslims all over the world.
"It is facing a nation than is in revolt, having risen from its lethargy to a renaissance of jihad," he added.
Ayman al-Zawahri, who is also known to be the operational head of al-Qaeda also participated in the uprisings that happened in the Arab countries.
"He went to his God as a martyr, the man who terrified American while alive and terrifies it in death, so much so that they trembled at the idea of his having tomb" he had said.
He further said that sacrifices would be made to "deprive America of security."
"The man who terrified America in his life will continue to terrify it after his death," reported the SITE Intelligence Group as the video was posted on varies militant websites.
"You will continue to be troubled by his famous vow: You shall not dream of security until we enjoy it and until you depart the Muslims' lands," said the Egyptian-born Al-Zawahri.
Zawahri in the video also criticised the US for depositing the body of Bin Laden at sea and showered praise on Laden, who was killed by the US Navy SEALs on May 2 in Abbottabad. He urged the people of Pakistan to rise against the countries rulers calling them "traitors".