Police were called to the property on Argyll Road at around 5.25pm on Friday (January 17) after “concerns for the welfare of the occupant”.
When officers attended they found Marianne’s body at the scene.
As of Tuesday (January 21) no arrests have been made but a murder investigation is underway.
Detective Chief Inspector Suzanne Soren, from Specialist Crime South, who is leading the investigation said: “This is a tragic crime and our thoughts at this incredibly difficult time are with Marianne’s loved ones and colleagues.
“We are in contact with her family, who are being supported by specialist colleagues.
“I know this is a concerning time for the wider community and want to reassure the public that whilst we are in the early stages of this investigation, we believe the suspect was known to Marianne and there is no wider risk to the public.
“This is a fast-paced investigation and I would urge anyone with any information to come forward. Please call 101 quoting CAD 5231/17Jan or to report anonymously you can contact Crimestoppers on 0800 555 111.”
A formal identification of Marianne’s body has taken place.
