Register the death
If the death has been reported to the coroner (or Procurator Fiscal in Scotland) they must give permission before registering the death.
You can register the death if you are a relative, a witness to the death, a hospital administrator or the person making the arrangements with the funeral directors.
You can use the Register a Death page on the gov.uk website that will guide you through the process. This will also explain the registration process for Scotland and Northern Ireland.