Yahya Sinwar, a key figure in Hamas, was pivotal in the attack on Israel on October 7, 2023, leading to intense clashes in Gaza. Known for his secretive nature, Sinwar was involved in building Hamas's security operations in the 1980s and was implicated in eliminating informants. His life story includes a long imprisonment in Israel, release in a prisoner exchange, and ultimately his leadership in Hamas until a fatal Israeli strike in 2023.