Mourners gathered outside of FDNY EMS Station 49 in Queens Friday to remember Alison Russo-Elling, the on-duty EMS lieutenant who was fatally stabbed to death less than a block away from her station Thursday.

Prosecutors charged Peter Zisopoulos, 34, with murder and criminal possession of a weapon in the connection to the stabbing, with officials say was an unprovoked attack.

Emergency responders took Russo to Mount Sinai Queens Hospital in Astoria, where she was pronounced dead, according to police.

“This event has cut deep into our souls and has rippled to the first responders communities across the nation,” said FDNY Chief of EMS Lillian Bonsignore. “We are heartbroken and are very angry.”

Russo, who was a 24-year veteran, began her career as an EMT with the department in March 1998. In 2001, she aided in the rescue and recovery efforts at the World Trade Center.

Her years in service were acknowledged in 2016, when she was promoted to lieutenant. During her time in the role, she worked under the Dignitary Protection Unit and was assigned to former Vice President Mike Pence on a New York City visit.

Russo’s friend, Anthony Almojera, said that when she was not working in the city, she volunteered in Long Island as a paramedic. He said she was planning to retire at the beginning of the year.

“Alison had to continue to work because she did not make enough money to be able to retire when she wanted to,” Almojera said. “She was 61 years old, still responding to 911 calls.”

Gov. Kathy Hochul announced on Thursday that all flags on state building will be flown at half-staff Friday morning, and returned to full-staff following Russo’s funeral service.

“We mourn the loss of Alison Russo-Elling, an EMT Lieutenant who was killed while on duty,” Hochul said. “Our hearts are with her family as we honor her life and remember her as a hero. I know all New Yorkers are grateful for her service over more than two decades with FDNY and as a World Trade Center first responder.”