Officers investigating the death of a 42-year-old woman say it was "likely to be linked to a medical condition".
Kelly Godfrey, of Bromsgrove, died in hospital last Wednesday, a day after police were called to an incident.
A post-mortem examination was held over the weekend and her death is not currently being treated as suspicious, West Mercia Police said.
A woman aged 28, who was arrested on suspicion of assault has been released under investigation, police added.
Det Insp Gerry Smith said: "Our thoughts are with Kelly's family and friends at this sad time."