A bipartisan group of lawmakers in the U.S. House of Representatives on Tuesday night held a moment of silence for American-Israeli Omer Neutra who was determined this week to have been killed by Hamas on Oct. 7, 2023, after it was believed that he had been alive for more than a year.

Neutra, 21 years old, was a tank platoon commander in the 7th Armored Brigade’s 77th Battalion in the Israeli Defense Forces (IDF) and was among the first to respond to the Hamas attack that ultimately killed some 1,200 people and initially saw the abduction of more than 250 men, women and children. 

His parents, Orna and Ronen, who spoke with Fox News Digital just days prior to the tragic development, believed their son was still alive after the IDF had long assessed that he, along with Nimrod Cohen, another soldier from his tank, were taken hostage into Gaza and remained alive.

7 US HOSTAGES STILL HELD BY HAMAS TERRORISTS AS FAMILIES PLEAD FOR THEIR RELEASE: 'THIS IS URGENT'

"For 420 days Omer’s parents and his brother Daniel have done everything they can with the love and support of hundreds of thousands of others to free their son from captivity," Rep. Tom Suozzi, D-N.Y., who represents the Neutra family’s district, said from the House floor. "Every day they soldiered on through alternating deep sorrow and brief bursts of hopefulness. They went from crushing anxiety to steely determination. 

"Just a few days ago we learned that this courageous young man, this bright light, this courageous idealist, made the ultimate sacrifice," Suozzi continued. "Omer had not been alive for the last 422 days, he was murdered on Oct. 7."

Footage from the attack on Omer’s tank showed the commander, as well as three others, Shaked Dahan, Oz Daniel and Nimrod Cohen being pulled from the military vehicle by Hamas terrorists and being taken captive. 

Daniel and Dahan had previously been assessed to have been killed following the attack, and according to the IDF, intelligence now suggests Omer, a descendant of Holocaust survivors, was also killed on Oct. 7. 2023.

AMERICAN FATHER OF HAMAS HOSTAGE ITAY CHEN PUSHES US, ISRAEL ON ‘PLAN B’ AS NEGOTIATIONS FALTER

The Israeli military has not said how they came by this new information and the fate of Cohen remains unknown.

In a memorial service held for Omer on Tuesday in the Long Island synagogue where he reportedly celebrated his bar mitzvah years earlier, Omer's father Ronen, said the news had left them "breathless and empty."

"For over a year now, we’ve been breathing life into your being, my beautiful boy," Orna said through tears, according to reports. "With the hope and love of so many, we kept going and going and going, keeping you alive, speaking your name from every outlet, pushing any hint of despair, not stopping to breathe or to take in the deep pain of your absence." 

"Now things are clear," she said to the reported 1,500 attendees at the service. "But not as we’d hoped."

Onra and Ronen have described their son as loving, a good friend and an athlete, but they also highlighted his ability to lead and how his actions on Oct. 7, 2023 saved lives. 

Omer’s body is believed to still be held by Hamas along with the six other American hostages, only three of whom are still assessed by the IDF to be alive at this time, including Edan Alexander, Sagui Dekel-Chen and Keith Siegel.

Hersh Goldberg-Polin's body was recovered after he, along with five others, were discovered to have been murdered by Hamas in the tunnels in Gaza in August.

There are still 100 hostages held by Hamas in Gaza following the recovery of Itai Svirski’s body on Wednesday, an Israeli hostage taken during the attack on Kibbutz Be’eri on Oct. 7, 2023.

The IDF confirmed he "was murdered in captivity by his captors, and his body was held hostage in the Gaza Strip."