Umar was born Shaan-ul-Haq at Sambhal, Uttar Pradesh, and went to Pakistan in 1995 and joined the Harkat-ul-Mujahideen (HuM), Indian security officials said.
Asim Umar, who led the AQIS from its formation in 2014, was killed during a joint US-Afghan raid on a Taliban compound in Musa Qala district of Helmand province on September 23, Afghanistan " s National Directorate of Security (NDS) said.
Six other AQIS members were also killed, "most" of whom were Pakistani, the report said citing the NDS statement. "Among them was Raihan, Omar's courier to [Al Qaeda chief] Ayman al-Zawahiri", the spy agency added.
The raid was part of a lengthy and confusing overnight operation on September 22-23 for which the USA provided air support.More news: Peebles, Mayor and Queloz win 2019 Nobel Prize for physics
Umar, who was in early 40s, was designated as a "global terrorist" by the USA which placed the AQIS on the list of "foreign terrorist organisation" in 2016.
The NDS' tweets described Umar as "a Pakistani citizen", though people in Kabul familiar with developments said this could be because the slain terrorist was found with a Pakistani identity card.
The UN report found that USA and Afghan forces killed 717 civilians and injured 680 in the first six months of the year, up 31 per cent from the same period in 2018.
He "was #killed along with six other AQIS members, majority Pakistani", the NDS said on Twitter on Tuesday, adding that Umar had been "embedded" with the Taliban.More news: Unprecedented power shutdown coming as winds bring critical fire danger
However, peace talks fell through last month when President Trump cancelled secret plans to host Taliban members after they admitted to killing a United States soldier.
Word Omar's death came on the 18th anniversary of the first US airstrikes in Afghanistan following the September 11, 2001, terrorist attacks in New York City and Washington.
The middle-aged Umar was relatively unknown when he was picked to lead the newly created AQIS in 2014.
AQIS also claimed responsibility for the murder of activists and writers in Bangladesh, including U.S. citizen Avijit Roy and USA embassy employee Xulhaz Mannan.More news: Teen slain in front of mom outside Hamilton high school
Despite the operation taking down several senior members of Al-Qaeda, at least 40 people attending a nearby wedding party were inadvertently killed, according to local officials.