A man found dead in the Norfolk Broads at the weekend is expected to be formally identified by police later today.
The bodies of a man and woman were found in the River Bure between Salhouse and Wroxham Broad on Sunday.
Post-mortem examination results show the woman was dead before entering the water, possibly as the result of strangulation.
The man died of drowning, but officers are investigating the possibility that another factor, such as an overdose, contributed to his death.
Water in the area where the body was found is shallow and it is thought unlikely he died as the result of drowning alone.
The couple, both in their 40s and from Surrey, had been holidaying on the Norfolk Broads with a 13-year-old girl who was found alone but unharmed on the boat.
Concerns were raised over the weekend after a local boat hire company reported that the boat had not been returned on time.
The spot where the boat was moored is isolated and away from official stopping places. It is surrounded by wood and marshland with no foot access.
Police will carry out further forensic tests on the woman's body, and they are not looking for anyone else in connection with the incident.