French lawyers, acting on behalf of Alison's family, told Norwich Evening News: "We want to highlight the exceptional work carried out by the investigating magistrate in Mulhouse and the Gendarmes in Strasbourg, both past and ongoing, in determining the circumstances that led to the horrendous death of Alison Knott and her partner".
Alison Erb, 49, was found dead alongside her 51-year-old partner Loreto Di Salvatore at their flat in the city of Roppentzwiller.
Cops detained Alison's husband Olivier, a serving French police officer, immediately in the aftermath of her tragic death.
CCTV footage showed the suspect dressed in black and wearing gloves and a hood entering the flat on the day Alison and her lover were killed in 2023.
Alison was managing a nursery at the time of her death - and loved with Mr Salvatore in a flat above the town hall.