An inquest is due to be carried out on Tuesday on a man found dead in a car park in Redditch.
A post-mortem examination on Steven O'Brien, from Exhall Close, Redditch, has proved inconclusive and police are treating his death as unexplained.
The 41-year-old's body was found in a car at the Arrow Valley Lake last week.
The inquest is due to be carried out in Stourport. Worcestershire coroner Victor Round will attempt to find out how Mr O'Brien died.
Police are awaiting the results of toxicology tests but say they are keeping an open mind.
They say they have not ruled out foul play at this stage.