Nasiruddin, who was in his early 30s, was the group's financier and the son of its founder Jalaluddin Haqqani. He was killed by two gunmen riding a motorcycle while returning home from a mosque in a car in Barakahu area late last night.
Police sources confirmed that he was killed though there was no information on who was behind the attack. It was also not known what Nasiruddin was doing in the area and how his body was taken to Miranshah in North Waziristan Agency yesterday for burial.
Leaders of the Haqqani network were also quoted by the media as confirming his killing.
Nasiruddin was born in Paktika province of Afghanistan. He was put on the UN Security Council's sanctions list for individuals subjected to an assets freeze, travel ban and arms embargo after the 9/11 terror attacks. He was also on a US list of global terrorists.
According to the UN sanctions list, Nasiruddin had travelled to Saudi Arabia and the United Arab Emirates to raise funds for the Taliban and operated from Pakistan s North Waziristan tribal region.
The Haqqani network is considered the most dangerous Taliban faction in Afghanistan. Nasiruddin was mainly involved in "dialogue-related affairs" of the group.
Three more of Jalaluddin's sons have also been killed.
According to the US, Nasiruddin was a key financier and emissary of the dreaded network.
The Haqqanis have been blamed for high-profile attacks in Kabul and elsewhere in Afghanistan, including the 2008 bombing of the Indian Embassy that killed 54 people. The network was also believed to be behind an attack on the Indian mission in Jalalabad. Nasiruddin s brother Sirajuddin currently heads the network. The Haqqani network is considered to be close to the Inter-Services Intelligence (ISI) and the Pakistani military.