Police and the coroner are trying to piece together information about the last movements of Gloucestershire man.
The body of Steven Betts, 46, was discovered in a stream in the Abbeydale area of Gloucester on 6 October.
A spokesman for the county's coroner said it was vital for the family to understand what happened in the days leading up to his death.
Mr Betts was seen on 1 October but his whereabouts until 6 October remain unknown. detectives said.
An inquest was opened and adjourned on Monday but his death is not being treated as suspicious.