Hamas leader Yahya Sinwar was killed in combat, Khalil Al-Hayya, deputy Gaza Hamas chief and the group's chief negotiator, said on Friday.
Sinwar's death, which follows Israeli assassinations of other Hamas leaders and commanders, will deal a huge blow to the group which has faced relentless air strikes since it attacked Israel on October 7, 2023, killing 1,200 people, according to Israeli tallies.
It also dragged about 250 people back to Gaza, creating a hostage crisis for Israeli Prime Minister Benjamin Netanyahu's far-right government which has vowed to eliminate Hamas.
Sinwar was named the group's paramount leader on August 6, as a successor to former political chief Ismail Haniyeh, who was assassinated in Tehran on July 31.
Widely known as the architect of the October 7, 2023 attack, Sinwar has been in Gaza, defying Israeli attempts to kill him since the start of the war.
Born in a refugee camp in the southern Gaza city of Khan Younis, Sinwar, 62, was elected as Hamas' leader in Gaza in 2017.
The controversial leader, who spent half his adult life in Israeli prisons, was the most powerful Hamas leader left alive following the assassination of Haniyeh.

Fire in rebel-held east Congo kills 24 schoolchildren
Trump touts $5,000 payout if Republicans win as Vance waits in wings
Search expands after Philippine ferry fire kills five and leaves dozens missing
Trump says Iran war to end after US midterm elections
At least 20 killed in cargo vessel fire at China shipyard, state media reports
US military says it struck vessel in Caribbean, killing 3
At least 14 killed in explosion at weapons depot in Syria
US hits five Iranian oil tankers after attack on Navy ships
