Police arrest a man after they say stabbed his girlfriend to death in Queens.

Cops responded to calls of a domestic dispute around 2 a.m. Sunday at a building on Beach 32nd Street near Seagirt Boulevard in Far Rockaway.

They found a 51-year-old woman with stab wounds to her neck and chest.

Police say her 74-year-old mother was slashed across her hand while trying to break up the fight.  

A 42-year-old man was taken into custody, but his identity has not been released.

Police say a knife was found at the scene.