An officer from the D.U. Police Department in Washington, D.D., was shot and killed in the line of duty on Sunday, authorities said.
The officer was identified by his initials as John F. Kelley, 47.
Kelley’s father, Mark, said in a statement that his son was a loving husband and father who served his country.
“He would have been a great hero to many,” he said.
“And we thank God that his death was preventable.
The community must not give in to hate.
Our deepest sympathies are with his family and friends.
The people of Washington, DC, have lost a true hero.”
Kelley’s killing comes less than two weeks after a police officer in Georgia was killed by a man who had killed two women in a parking lot.
Authorities are still looking for a third man who they said opened fire on a police patrol car on July 7 in downtown Atlanta.
The shootings come just days after a gunman shot dead a police sergeant in Minnesota, and three days after an officer in Wisconsin was shot dead by a burglar who broke into his home.
Officials said Saturday they were still searching for the gunman, who remains at large.
The FBI is also looking into the shooting, which was captured on surveillance video.
The Associated Press contributed to this report.