Police have named a 43-year-old man who died after he was found collapsed in a Wallasey garden on Tuesday night as Stephen Alan Pickering.
At about 7pm Mr Pickering was found in the backyard of a property in Clarendon Road and taken to hospital where he died shortly afterwards.
A post mortem to establish the cause of death has been completed and its results are being withheld pending further tests.
The two men, aged 46 and 44, and a 38-year-old woman who were arrested in connection with the investigation have been released on police bail pending further enquiries.
Enquiries are ongoing.
Anyone with information that could help police in their inquiries should contact Merseyside Police on 0151 777 2236 or Crimestoppers on 0800 555 111.
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