Officers have renewed an appeal for information after a man was found collapsed in the street and later died.
The 46-year-old was found in Clumber Street, Mansfield, at around 6.35am on Wednesday and died in hospital.
A Nottinghamshire Police spokesman said: "Officers are still trying to establish his movements before he was found and believe there may be people who saw him walking around the area who have not yet come forward.
"Anyone who drove past that area who has dash-cam footage may also be able to help.
"Please contact Nottinghamshire Police on 101 or Crimestoppers on 0800 555 111, quoting incident number 66 of March 14, 2018."