The victim was identified as Corey Comperatore, according to his family's posting on Facebook.
"The PA Trump Rally claimed the life of my brother, Corey Comperatore. The hatred for one man took the life of the one man we loved the most," the victim's sister said in the post on Sunday.
Comperatore previously served as the chief of the Buffalo Township Volunteer Fire Department, according to a report by the Pittsburgh Post-Gazette.
Shapiro said he had spoken to Comperatore's family and he relayed parts of the conversation to reporters.
"Corey died a hero. Corey dove on his family to protect them last night at this rally," Shapiro said. "Corey was the very best of us."
Comperatore was survived by a wife and two daughters. "Corey was a girl dad," Shapiro said.
Shapiro added: "Corey was a firefighter. Corey went to church every Sunday. Corey loved his community and most especially Corey loves his family."
Shapiro described the victim "as an avid supporter of the former president."
Trump had just begun his speech at the Pennsylvania rally when the sound of shots rang out and it became apparent that Trump was also injured when a bullet grazed his right ear.
The FBI has identified 20-year-old Thomas Matthew Crooks of Bethel Park, Pennsylvania, as the suspect in what the government is calling an assassination attempt on Trump.
