At 12.13pm on the 21st of March, police received a call from the ambulance service regarding a concern for safety of a women at an address in Gibraltar Road, Halifax.
Emergency services attended and found a woman in her twenties unresponsive and in need of medical attention.
She was taken to hospital where she was found to have injuries and was sadly pronounced deceased a short time later.
The death is currently being treated as unexplained.
Three males aged 34, 35 and 56 and 41-year-old women have been arrested in connection with the incident and remain in police custody at this time.
Enquiries are continuing and a police cordon is in place for forensic examination.
Anyone with information regarding the incident, that may be able to assist with ongoing enquiries is asked to contact police on the 101LiveChat function on the website or by calling 101 quoting 13230159529.
Information can also be given to the independent charity Crimestoppers on 0800 555 111.