Authorities say that one man in the audience died while trying to protect his family during the attempted assassination of Donald Trump on Saturday.
Corey Comperatore, a 50-year-old volunteer fire chief, shielded his family by diving onto them when the shots rang out.
“Corey died a hero,” Pennsylvania Governor Josh Shapiro said at a news conference on Sunday.
Pennsylvania state police said the other two people shot were 57-year-old David Dutch and 74-year-old James Copenhaver. Both were in a stable condition on Sunday.
The Pennsylvania governor said that he spoke to Mr Comperatore’s wife and two daughters.
“Corey went to church every Sunday,” he said. “Corey loved his community. Most especially, Corey loved his family.”
He said that Mr Comperatore was an avid supporter of Donald Trump and was excited to be at the rally Saturday.
“Corey was the very best of us. May his memory be a blessing,” Mr Shapiro said. “Last night was shocking… political disagreements can never, ever be addressed through violence.”
State police said that Mr Comperatore lived in Sarver, about 12 miles (19km) away from the rally site in Butler, outside of Pittsburgh, Pennsylvania.
In addition to his volunteer firefighting work, he was employed as a project and tooling engineer at a plastics manufacturing company, according to his social media profiles.
“He was a good person,” neighbour Matt Achilles told the Pittsburgh Tribune-Review. “We might not have agreed on the same political views, but that didn’t stop him from being a good friend and neighbour.”
“He donated money to us when I was in the hospital and he would always come by at our yard sales. He always waved hello when I drove past his house,” Mr Achilles said.
Mr. Shapiro also mentioned that he spoke with the family of one of the injured, but he declined to provide details about the conversation.
One of the six to eight shots fired at the rally grazed the ear of former President Trump.
The gunman, identified by authorities as 20-year-old Thomas Matthew Crooks, was shot dead by Secret Service officers assigned to protect the former president.