Annette Creegan was formally identified by Norfolk Police after her body was found in the River Bure on the Norfolk Broads on Sunday.
Detectives believe she was dead before entering the water, probably as the result of strangulation.
Her partner, named locally as John Didier, died as the result of drowning. His death is not thought to be suspicious.
Police launched a search for the bodies after finding a 13-year-old girl alone on a boat after a hire company alerted police that the vessel had not been returned on time.
For more on this story visit the ITV News Anglia website.
More top news
The twins cubs, which were born in June, have been named Bert and Ernie after characters from Sesame Street.
The two victims died from their injuries in hospital after the explosion in Hertfordshire.
Investigations are continuing into the cause of the crash in chigwell which killed both people on board.