Yes, IDF has declared Nasrallah is dead.

IDF says terror chief Hassan Nasrallah, other Hezbollah leaders killed in Beirut strike

In a statement, the IDF says that alongside Nasrallah, the commander of Hezbollah’s so-called Southern Front, Ali Karaki, was also killed, along with other commanders.

Nasrallah was targeted while at Hezbollah’s main headquarters in the southern suburbs of Beirut, a Hezbollah stronghold known as the Dahiyeh.

The headquarters is underground, beneath residential buildings in the Dahiyeh, the IDF says.

“The strike was carried out while the top brass of Hezbollah was at their headquarters and engaged in coordinating terror activities against the citizens of the State of Israel,” the military says.

Zechariah 12:2-3

2 Behold, I will make Jerusalem a cup of trembling unto all the people round about, when they shall be in the siege both against Judah and against Jerusalem.

3 And in that day will I make Jerusalem a burdensome stone for all people: all that burden themselves with it shall be cut in pieces, though all the people of the earth be gathered together against it.

KJV

Huge implication as to what will happen next. More on this as news unfolds.