The slain officer was identified by police as Ashley Guindon.
Two of her colleagues were also injured in the shooting and had been admitted to a hospital, but no details have been released about their condition,reports the Sydneymorningherald.
After the shooting, they were flown by helicopter to Inova Fairfax Hospital in Virginia.
The suspect, a military serviceman, was unharmed, and is now in police custody.
The suspect had murdered his wife, then opened fire at officers as they approached.
A woman, who lives on Lashmere Court, said she was visiting a neighbour when she heard shots, but did not think gunfire could have broken out on her quiet and close-knit street.