Further forensic tests are expected to take place on the body of a woman who was found in a river alongside her partner after being apparently strangled.
Norfolk Police said detectives were treating her death as suspicious after a post-mortem examination that found she died before entering the River Bure.
Officers launched a search after finding the woman's 13-year-old daughter alone but unharmed on a cruiser on the Norfolk Broads on Saturday.
Neither body has been formally identified but police said the man's death was not being treated as suspicious.
The pair were both in their 40s and from the Surrey area. The man died as the result of drowning, police said yesterday.
A couple found dead in a river on the Norfolk broads are from Surrey, police have revealed.
The bodies were found by police searching a river after a 13-year-old girl was found alone on a boat.
The alarm was raised after a member of the public called police at around 5pm yesterday concerned that a holiday hire boat had not been returned as arranged at the end of the week.
Police said the deaths are currently being treated as unexplained but officers are not looking for anyone else in connection with the incident.
The bodies of a man and a woman, both thought to be in their 40s and believed to be from the Surrey area, were discovered in water yesterday afternoon by divers between Salhouse Broad and Wroxham Broad after an extensive search was carried out at the location.
Home Office post mortems will take place this afternoon.
Detective Superintendent Jes Fry, of the joint Norfolk and Suffolk Major Investigation Team, who is overseeing the investigation, said: “We continue to investigate this tragic event. Our main consideration is the welfare of the 13 year girl."