French police investigating the murder of a British woman who was found with eight stab wounds have taken DNA samples from the mayor of the town she lived in, along with 14 others.

Karen Carter, 65 and a married mother of four, was found dead outside her home in Trémolat, east of Bordeaux, following a night out with friends on April 29.

Just a few hours before her death, she had attended a wine tasting hosted by Jean-François Guerrier, her 75-year-old lover.

In attendance were 15 others, including Eric Chassagne, the mayor of Trémolat.

Chassagne told local media: 'I believe that everyone who may have met Karen during the day and evening of April 29th has been sampled.