Detectives have named a woman who was found dead at a house in Stoke-on-Trent.
The body of Gillian Hiney, 48, was discovered in Cardwell Street early on Wednesday when police were called.
A 58-year-old man from the city was arrested by Staffordshire Police on suspicion of murder. He has been released without charge.
Police said investigations are continuing to establish the cause of Ms Hiney's death.
Det Ch Insp Dave Giles said: "A detailed investigation will continue in an effort to establish whether Gillian's death was caused by another person or whether it was as a result of a medical condition."
Police said a post-mortem examination took place on Wednesday afternoon, but did not establish a clear cause of death.
Forensic investigators will continue with a detailed examination of the property over the next 24 hours.