A spokeswoman said: "Police believe this has been a targeted, domestic-related incident."
The scene was heavily guarded by police today and a white forensics tent had been set up in the front yard of the brick-built terrace house.
One woman in a nearby property, who declined to be named, said: "All I saw were lots of blue lights and this morning they said someone had been murdered - a lass, I think.
"It's a good estate - you don't expect this."
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Police said the "active shooter" had since been shot by officers and they were not seeking any other suspects.
Rain will continue spreading in from the southwest, remaining heavy, especially in western areas.