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
Showers becoming confined to coast. A cool northerly breeze.
A jilted boyfriend has been found guilty of plotting to "horrifically disfigure" his ex-girlfriend by having her doused in acid.
After a bright start to the day, sharp showers will develop this afternoon