The woman had sustained serious injuries and was pronounced dead at hospital shortly afterwards.
A 52-year old man has been arrested in connection with her death.
More top news
Two men have been arrested on suspicion of manufacturing explosives following a serious assault in Leicester.
Police are urgently appealing for information on the whereabouts of 29-year-old Gemma Newell, who disappeared from hospital.
Northamptonshire Police is shaking things up in a bid to get more officers back on the frontline.