A rally attendee was killed and Grant Prestontwo others were critically injured in Saturday's attempted assassination of former President Donald Trump at a political rally in Butler, Pennsylvania.

On Sunday, authorities identified the person killed as Corey Comperatore, a firefighter from Sarver, Pennsylvania, who had two daughters and was an avid Trump supporter.

Two men injured in the shooting – a 57-year-old New Kensington, Pennsylvania, resident and a 74-year-old resident of Moon Township – were still in critical condition at Allegheny General Hospital on Monday morning, according to Bill Toland, director of public relations for the Allegheny Health Network.

Toland noted the hospital system uses a different rating system for patients' conditions than the Pennsylvania State Police, which has said the two men were in "stable" condition. Their hospital-listed condition status has not changed since their arrival, Toland said. Toland said the patients were transported to the hospital by the system's LifeFlight helicopters directly from the rally.

Trump is recovering after he was injured in the right ear when a gunman, identified by the FBI as 20-year-old Thomas Matthew Crooks, opened fire with an AR-15-style rifle on a rooftop about 400 feet outside the rally. Crooks, the suspected shooter, was killed by law enforcement officials moments after shots were fired.

Here's what to know about the victims of the rally shooting.

Live updates:Biden says America 'must not go down this road' after Trump assassination attempt

Who are the victims from the Trump rally shooting?

These are names of the three victims from Saturday's shooting, according to the Pennsylvania State Police:

• Corey Comperatore, 50: Deceased. Comperatore was from Sarver, Pennsylvania.
• David Dutch, 57: In critical condition. Dutch is from of New Kensington, Pennsylvania.
• James Copenhaver, 74: In critical condition. Copenhaver is from Moon Township, Pennsylvania.

Rep. Ronny Jackson, R-Texas, also said Saturday on X that his nephew was among those with minor injuries at Trump’s rally.

On Fox News Saturday, Jackson told host Sean Hannity that a bullet had grazed his nephew’s neck. He noted on X that his nephew is doing well and that his injury was not serious. 

In addition to the victims, the shooter, Crooks, was killed by law enforcement officials.

Firefighter Corey Comperatore shielded family killed in rally shooting

Comperatore, a 50-year-old former chief of the Buffalo Township Volunteer Fire Company, was said to be shielding his family from the gunfire when he was struck.

That came as no surprise to the Buffalo Fire Co.'s current Chief Kip Johnston.

"He always made sure everybody came out safe," Johnston said.

On Sunday, black bunting was strewn from the station's sign and across Comperatore's locker. His helmet, jacket and other gear were placed on display outside the station. Flowers were placed at the base.

"There's a lot of history with him and a lot of great memories and stuff we'll never forget," volunteer firefighter Gary Risch Jr. said of his friend. "I mean, they don't get much better than him."

"Yesterday time stopped," Allyson Comperatore, his daughter, said on Facebook. "And when it started again my family and I started living a real-life nightmare."

Fundraisers organized for rally shooting victims

A high-profile fundraiser, organized by Meredith O'Rourke which says it is "President Trump authorized" has raised over $3.9 million from over 52,000 donations as of Monday morning. Top donations include $50,000 from the conservative think tank The Heritage Foundation, $50,000 from American Hartford Gold, $50,000 from UFC CEO Dana White and $50,000 from the singer Kid Rock.

Another GoFundMe was created for the family of Corey Comperatore, the firefighter killed in the shooting. It has since raised over $800,000 from more than 15,000 donations.