The Israeli Defense Forces said it was checking unconfirmed reports on October 17 that Yahya Sinwar, the leader of Iran-backed Hamas, which has been designated a terrorist organization by the United States and European Union, was killed during military "operations" in the Gaza Strip.
Update: He’s definitely dead. According to the NYT:
The Israeli military confirmed that Yahya Sinwar, the leader of Hamas, was killed on Wednesday. His body was definitively identified by the Israeli authorities, the military said.
Update: He’s definitely dead. According to the NYT: