Detectives are continuing to investigate after a man died at a property in Stoke on Saturday evening.
Police were called at 9.30pm by West Midlands Ambulance Service after they attended a property on Lime Street, Stoke. Sadly, despite the best efforts of paramedics, a 34-year-old man died at the address.
A Home Office post mortem is due to take place.
A woman, 30, and two men, aged 35 and 42, all from Stoke-on-Trent, have been released under investigation pending further enquiries. A 32-year-old man, from Stoke-on-Trent, has been released on conditional bail pending further enquiries.
Anyone with any information should message Staffordshire Police on Facebook or Twitter quoting incident number 769 of 20 February, call 101 or alternatively contact Crimestoppers anonymously on 0800 555 111.