Sarah Montgomery – a 27-year-old mother-of-two – died at a house in Donaghadee, County Down, on Saturday.
The 28-year-old man is due to appear before Newtownards Magistrates’ Court on Wednesday, the Police Service of Northern Ireland (PSNI) said.
Floral tributes have been left outside Ms Montgomery’s home.
A 47-year-old woman arrested as part of the investigation was released unconditionally on Tuesday.
