Gemma Watts, 48, and Steven Sansom, 44, both appeared at the Old Bailey in April charged with murder.
They are also charged with preventing a lawful and decent burial.
The court heard Ms Watts, from New Addington, Croydon, and Mr Sansom, from Sutton, south London, are alleged by prosecutors to have killed Ms Mayhew at a residential property on the night of 8 March.
The court heard Ms Mayhew’s body was then allegedly cut up and dumped.
At the time, the Old Bailey heard that Ms Mayhew’s remains had not yet been fully recovered and searches were continuing.
Both defendants were remanded into custody.
Det Insp Martin Thorpe said on Wednesday: “My thoughts remain with Sarah’s family. We will continue to provide our support as our investigation progresses.
“At present we are not looking for anyone else in connection with her death.”
Det Insp Thorpe added officers were expected to remain at the scene for some time to continue their work.
