The 35-year-old Rwandan showcased Rwanda’s clothing brands on the international scene.
Preliminary reports suggest she died after being stabbed by a domestic worker, Rwanda's private pro-government paper the New Times reports.
It has emerged that she was due to get married next month and wedding invitations had been sent out, it says.
Private Ugandan paper the Daily Monitor adds that Ms Mupende lived in Kenya, where she was born, Uganda and Rwanda.
It says she did her primary and secondary school education in Kenya and Uganda respectively before moving to Rwanda, where she studied Business Information and Technology.