An elderly American Israeli with deep ties to New York has become the first US citizen confirmed to have been killed while being held hostage by Hamas terrorists, it was announced Friday.

Gadi Haggai, 73, was murdered by the terror group who are still thought to be holding his 70-year-old wife, Judih Weinstein, according to the Hostages and Missing Persons Families Forum representing the families.

“Gadi was a man full of humor who knew how to make those around him laugh,” the families group told the Times of Israel.

“A musician at heart, a gifted flutist, he played in the IDF Orchestra and was involved with music his whole life.”

Haggai, whose mother was born and raised in Manhattan and whose father is from Detroit, and Weinstein, a native of Goshen in upstate New York, moved to Israel 30 years ago, seeking solace in the Jewish state — until Hamas’ surprise terror attack on Oct. 7 shattered their peaceful existence.

The couple had been taking their usual walk outside Kibbutz Nir Oz when armed Hamas militants on motorcycles ambushed them that morning, relatives said.

Kibbutz Nir Oz said Friday the Israeli Defense Forces informed Haggai’s family that he had been murdered.

His body is still in the hands of their captors in the Palestinian territory; Weinstein’s fate remains unknown.

The day they were attacked, Weinstein managed to call one of the kibbutz members for help, saying she had been shot in the arm and was wounded in the face and Haggai had been shot in his head, according to Haaretz.

Shortly before the couple was believed to be taken hostage, Weinstein was also able to text her daughter in Singapore. A paramedic later told the couple’s children that she had called for medical help — but they lost contact with her.

“She said they were shot by terrorists on a motorcycle and that my dad was wounded really bad,” Iris Weinstein Haggai told the Times of Israel.

“Paramedics tried to send her an ambulance. The ambulance got hit by a rocket.”

The family had not heard from the elderly couple since.

“We know that they were badly wounded. We know that [Weinstein] still had the phone with her to be able to call and ask for help and provide details. But ever since then, we lost all contact with them,” the couple’s niece, Ofri Haggai, 47, told The Post last month.

The phone was found hours later by the Israeli military — raising hope that the couple might have been among the more than 220 Israelis taken hostage during the brutal assault, instead of among those killed, she added.

The quest to find out what happened to her relatives brought Ofri Haggai, a global human resources manager in Israel, all the way to her aunt’s native Orange County, New York, home to seek the help of local politicians.

It remains unclear how officials were able to determine Gadi Haggai had died in captivity, as Hamas officials do not comment on the death reports.

He leaves behind four children and seven grandchildren.

President Biden said he and first lady Jill Biden were “heartbroken” by the news of Haggai’s death in a statement issued Friday.

“We continue to pray for the well-being and safe return of his wife, Judy (sic),” Biden said, noting that the couple’s daughter had been part of a phone call he had held with the families of hostages just last week.

“Today we are praying for their four children, seven grandchildren, and other loved ones and are grieving this tragic news with them.”

He went on to reaffirm his pledge to the remaining hostages and their families that the administration “will not stop working to bring them home.”

According to Israel’s official tally, 129 people are still in captivity in the Gaza Strip.

Of those, 22 are dead, the Israeli government says.

The forum said that between five and 10 of the hostages hold US citizenship. The US Embassy had no immediate comment.

With Post wires