A man detained by members of the public following a suspected robbery later died in hospital, police have revealed.
Detectives have appealed for witnesses to the incident in Wolverhampton following the death of the 29-year-old.
Officers received a 999 call shortly after midnight on Sunday, 16 October, reporting a bag had been snatched from a woman in Stafford Street, Oxley.
Two men, who witnessed the crime, had detained the suspect and requested the police attend.
Officers arriving at the scene arrested the man, who then became unwell.
They began to carry out emergency CPR until paramedics took over.
The man was taken to hospital but died on Wednesday, 19 October.
Detective Inspector Greg Evans, from Wolverhampton CID, said: "We are piecing together what happened on Sunday and it is really important that people who were in the area at the time come forward.
"We know the man who made the original 999 call asked a passing member of the public to help him confirm the location as he was unsure.
"That passer-by then spoke to the 999 operator but left the scene. I really need him to contact me or one of my team so I can clarify what he witnessed.
"I am also interested in speaking to an elderly couple that were seen walking along the street at the time of the incident.
"There were also a number of cars that would have passed the location and I would like the drivers and passengers to come forward too.
"We have specialist officers who are supporting the family of the man who died."
Further tests are required following a post-mortem examination.
The Independent Police Complaints Commission (IPCC) has been notified as well as the Black Country Coroner and enquiries are continuing
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