Israel-Gaza live updates: Israel 'deepening the war' in Gaza: Netanyahu

Gadi Hagi, a 73-year-old American-Israeli hostage and member of Kibbutz Nir Oz, has been confirmed dead, the kibbutz said.

Hagi was killed on Oct. 7 at the kibbutz and his body was taken to Gaza where it's still being held, according to a kibbutz spokesperson.

Hagi’s wife, 70-year-old Judy Weinstein, is wounded and still being held hostage, the kibbutz said.

Hagi and his wife were shot and kidnapped on Oct. 7, according to the Hostage Center.

"Gadi was a man full of humor who knew how to make those around him laugh," the Hostage Center said in a statement. "A musician at heart, a gifted flautist, he played in the IDF Orchestra and was involved with music his whole life."

Hagi was a father of four and a grandfather of seven.

Hagi reportedly has ties to New York.

"May Gadi's memory be a blessing," New York Gov. Kathy Hochul wrote on social media. "There are still many hostages -- including many with New York connections -- being held in Hamas captivity."

President Joe Biden said he was "heartbroken by the news."

"We continue to pray for the well-being and safe return of his wife, Judy," Biden said in a statement. "We are praying for their four children, seven grandchildren, and other loved ones and are grieving this tragic news with them."

Biden said Hagi's daughter joined, via phone, his meeting last week with families of hostages.

"Those families bravely shared with me the harrowing ordeal that they have endured over the past months as they await news of their loved ones," Biden said. "I reaffirm the pledge we have made to all the families of those still held hostage: we will not stop working to bring them home."

The United Nations Security Council has passed a resolution calling for urgent steps to allow safe, unhindered and expanded humanitarian access throughout Gaza.

Thirteen nations voted in favor, none voted against and two -- the U.S. and Russia -- abstained.

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UN Security Council passes Gaza aid resolution

The resolution called for urgent steps to allow safe, unhindered and expanded humanitarian aid throughout Gaza.

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U.S. Ambassador to the U.N. Linda Thomas-Greenfield said the U.S. abstained from the vote because "the Council was not able to condemn Hamas' horrific terrorist attack on Oct. 7."

"I can’t understand why some Council members are standing in the way, and why they refuse to condemn these evils unequivocally," she said. "I will never understand why some Council members have remained silent in the face of such evil."

In response to the resolution passing, the Red Cross said in a statement that it welcomes the demands for humanitarian access, the release of hostages and for international humanitarian law to be upheld.

But with the Gaza death toll climbing and the living conditions continuing to deteriorate, "much more is clearly needed," the statement said. "The only way fully to protect Palestinian lives, enable a sufficient humanitarian response, and offer the best chance of hostage release, is to stop the fighting."

"The failure of the [U.N. Security Council] to demand an immediate and sustained ceasefire is unjustifiable," the Red Cross said.

Israeli forces -- which are "almost in full operational control" of northern Gaza -- are continuing to fight on the ground in the southern Gaza city of Khan Younis, and are now "preparing to expand operations" to more parts of southern Gaza, said Israel Defense Forces spokesperson Rear Adm. Daniel Hagari.

This week, in Issa in the south of Gaza City, Hagari said Israeli forces found and destroyed an underground tunnel that was hundreds of meters long and had command and control rooms.

Asked about Israel’s investigation into how Hamas pulled off its Oct. 7 attack, Hagari noted, "Some areas of [Hamas'] tunnels were attacked in the past and restored -- we will examine why we estimated that the restoration would take longer."

The surviving members of Kibbutz Reim have relocated as a unified group to temporary housing in Tel Aviv. The move creates a "first-of-its-kind urban kibbutz," according to a statement from the kibbutz.

The families will live in a compound that includes two buildings and a community center, similar to what the original kibbutz had. The new temporary housing will also connect the survivors to services including psychological support and a local school.

-ABC News’ Becky Perlow