The banned Tehreek-i-Taliban Pakistan confirmed on Monday the death of its deputy chief Khan Said Mehsud, alias Sajna.
At least three suspected Taliban infiltrators killed up to 16 Afghan security personnel in southern Helmand province Saturday, officials and local media reported on Sunday.
The terrorist group nominated Mufti Noor Wali Mehsud to take his place, the statement added.
Helmand is one of Afghanistan's most violent provinces, and also a major source of opium, the narcotic used to make heroin.
Tariq says Wali enjoys the backing of Mullah Fazlullah, the leader of the Pakistani Taliban who is believed to be hiding in Afghanistan.
Reconstruction will cost $88.2 billion
Millions of people were displaced, in particular in the Sunni north, as a result of the battles and thousands were killed. The $88.2 billion estimate was based on an assessment study by Iraqi and worldwide experts, the planning minister said.
Donald Trump's Afghanistan strategy will embroil the United States in a "perpetual war" that is doomed to fail, a senior Pakistani official has warned.
The TTP has been blamed for many suicide bombings and other attacks.
Pakistani Taliban confirmed on Monday that its senior commander was killed in a U.S. drone strike in the country's North Waziristan tribal region last week and said they had appointed a new deputy to take his place.
Relations between the United States and Pakistan have been strained since January 1 when Trump's denounced Pakistani "lies and deceit" over its support for the Afghan Taliban and their allies.
Mehsud has kept militant attacks going not only against military targets in South Waziristan but also at times deeper inside Pakistani territory.