Wolverhampton murder victim was stabbed in the chest
A man found in a Wolverhampton street who is the centre of a murder investigation died from a stab wound to the chest, police said.
A member of the public alerted officers to the body in Treynham Close in the Stowlawn area of the city at about 21:30 BST on Saturday.
A post-mortem was carried out on Sunday on the 21-year-old man, who has not been named.
West Midlands Police said they remain "open minded" about a likely motive.
Det Insp Warren Hines said: "We believe we've traced a man who went to the victim's aid but who unfortunately left the area before officers could speak to him."
Police said they are officers were carrying out "an extensive trawl" of local CCTV cameras and are making enquiries with nearby residents.