Essex Police have said the man and woman found dead in a hotel swimming pool at Hatfield Heath were staying there together.
Chief Inspector Nick Lee confirmed police were not looking for anyone else in connection with the deaths.
"As part of the investigation we are trying to focus on what the relationship was between the victims
"It's a very busy hotel, there were a number of functions going on.
"At the moment we haven't ascertained as to whether these individuals were part of any function or not."
More top news
The TV star Griff Rhys Jones has been part of an 8 hour reading marathon to celebrate the author of Swallows and Amazons.
A windy evening, clear spells and a few blustery showers. Strongest winds are likely along coastal areas.
Around 170 officers and staff from Cambridgeshire police, were drafted in to manage the demonstration.