Firefighter Mitch Lundgaard was a 14-year veteran of the Appleton Fire Department, Appleton Fire Chief Jeremy Hansen said at a press conference Thursday.
The 47-year-old man died at a hospital from his injuries, police said.
Authorities said the investigation into the incident is ongoing and that funeral arrangements are pending for the firefighter.
"So that the Appleton Fire Department and his family knew that even though he's not there at home, that he is guarded and we all feel that loss with them and for them", said Jones.
"It's a brotherhood and a sisterhood", said Brent Jones, MFD, Professional Firefighters of Wisconsin Honor Guard commander.
Cash said it was disheartening that this happened during National Police Week, when the nation recognizes the sacrifices of officers.
'One of the other people shot was an Appleton police officer who is recovering in a local hospital.
"I saw the guy shoot a female, and she went down", Mourning added, "and another shot was sacked, and there was another male, and he went down, and then I saw the shooter flee". A police spokesperson said she was unsure whether a suspect was arrested.
Police on motorcycles led the procession as it made its way north about 120 miles on Interstate 41.
In a statement released Thursday on Twitter, Evers said he and his wife, Kathy, "send our deepest sympathies to the family, friends (and) colleagues of the firefighter who lost their life last night".
"We stand with our courageous first responders ... as they mourn this loss", Evers said.
The condition of the injured officer isn't immediately clear. A police officer was among those injured during the shooting Wednesday evening at Valley Transit in downtown Appleton. Police say there is no ongoing threat to the community, but didn't say if anyone is in custody.
Washington Co., WI - Firefighters across Washington County are lined up along overpassed on I41 as a sign of respect to a fellow firefighter killed in Appleton on Wednesday.