IPCC probe after Evesham man dies in Worcestershire
The police watchdog is investigating West Mercia Police's contact with a man who later died in hospital.
Six officers attended Stephen Marshall's flat in Evesham, Worcestershire, just after midnight on 23 November after ambulance staff requested assistance.
The 54-year-old was taken to Worcester Royal Hospital and died on 29 November.
The Independent Police Complaints Commission probe (IPCC) said it was investigating.
A post-mortem examination into the death proved inconclusive and further test results are awaited, an IPCC spokesman said.
The spokesman said the officers were currently being treated as witnesses.
IPCC commissioner Derrick Campbell said: "My sympathies are with Mr Marshall's family at what must be a desperately sad and difficult time for them.
"When someone dies following contact with the police it is important that an independent and thorough investigation is undertaken so the circumstances are fully understood and any necessary action taken."