Detectives investigating the murder of Catherine Wells-Burr are appealing for more information from the public.
It follows reports of a figure seen at the site of the car fire, which was set in a lane off the A358 near Ashill in Ilminster earlier this month.
Catherine's body was found inside the car on the morning of September the 12th.
Rafal Nowak and Anna Julia Lagwinowicz have both been charged with conspiracy to murder and have been remanded into custody. Both are due to appear at Bristol Crown Court on October 9.
Another 38 year old man remains on police bail.