A former police detective who fought for the extension of health benefits for 9/11 responders was hailed as a hero Wednesday at his funeral.

“These heroes responded to calls for help. They did not hesitate; that’s who they were and still are,” police Commissioner James O’Neill said at the funeral for Det. Luis Alvarez, 53. “He and they viewed their efforts as an obligation that they promised long ago to the people we serve.”

And for many of the mourners, the loss also was a deeply personal one.

“Before he became an American hero, he was mine,” said Alvarez’s son, David.

Alvarez died Saturday in a hospice centre after a three-year battle with colorectal cancer. He attributed his illness to the three months he spent digging through rubble at the World Trade Center’s twin towers after the terrorist attack.

Luis Alvarez is shown testifying on June 11 during a House of Representatives hearing on reauthorization of the 9/11 Victim Compensation Fund. (Zach Gibson/Getty Images)

In June, a frail Alvarez appeared before the House judiciary committee in Washington with former Daily Show host Jon Stewart to request the extension of the Sept. 11 Victim Compensation Fund, which has been largely depleted.

“I did not want to be anywhere else but Ground Zero when I was there,” Alvarez said at the hearing. “Now the 9/11 illnesses have taken many of us, and we are all worried about our children, our spouses and our families and what happens if we are not here.”

Alvarez’s survivors include his parents, wife, three sons and three siblings.

“He told me he had been walking, and walking, and walking,” his sister Aida Lugo recounted Alvarez as saying the night before he died. “He wanted to sit in the chair.”

When asked where he had been walking, she said, “My brother responded, ‘I was walking to find first responders to make sure they get help.”‘

“How we walk with the broken speaks louder than how we sit with the greatest,” Lugo said.

New York congreswoman Carolyn Maloney, second from left, and former Daily Show host Jon Stewart, second from right, were among the mourners on Wednesday. (Timothy A. Clary/AFP/Getty Images)

Fighting for other first responders through the Victim Compensation Fund, Lugo said, became his “dying wish.”

After Alvarez and Stewart’s emotional testimony before Congress, the judiciary committee voted in support of a bill that would extend funding through fiscal year 2090.

Lugo said her brother was grateful to hear of the committee’s support. The bill awaits a full House vote.

Marine veteran

Alvarez was born in Havana and raised in the New York City borough of Queens. He served in the marines before joining the New York Police Department in 1990 and spent time in the narcotics division and the bomb squad.

In a statement after his death, Alvarez’s family called him its “warrior” and told people to remember his words: “‘Please take care of yourselves and each other.”‘

Alvarez, seen in a file photo, had been on the force for 11 years when the 9/11 attacks occurred. (New York Police Department via AP)

NYPD Chief of Detectives Dermot Shea tweeted that Alvarez was “an inspiration, a warrior, a friend.”

New York congresswoman Alexandria Ocasio-Cortez, who attended the funeral, tweeted that Alvarez “left us far too soon.”

“He spent his last days fighting for the 9/11 Victim’s Compensation Fund,” said Cortez. “Some issues should be above partisanship or delay. We must pass the bill as soon as Congress reconvenes.”

Jon Stewart, the former Daily Show host, lashed out at U.S. lawmakers as he spoke up for first responders who were called to duty on 9/11 and still bear the scars. 3:07

The $7-billion fund is being depleted and has cut benefit payments by up to 70 per cent. The bill pending in Congress would ensure the fund can pay benefits for 70 years.

Stewart criticized Congress in a session that was attended by uniformed firefighters and police officers but few lawmakers, leading to a back and forth in the media between the comedian and Republican Senate majority leader Mitch McConnell.

McConnell said in the days that followed Stewart’s appearance that the issue would be addressed and that he did not know why Stewart was “all bent out of shape.”

McConnell then met with a group of first responders and told ABC News he hoped to take up the legislation in the Senate before the August recess.