Emergency services were called to an area of Halifax after the sudden death of a woman at the weekend.
Both the ambulance service and police officers were called to an address in Boothtown on Sunday night.
A spokesperson for West Yorkshire Police said: "Police were called at 10.27pm yesterday by the ambulance service to a report of a sudden death of a 30-year-old woman on Boothtown Road.
"The death is not being treated as suspicious."
Keep up-to-date with all the latest news and breaking incidents in Halifax - join our dedicated Facebook group here.