Police investigating the death of Catherine Wells-Burr are appealing for information from anyone who may have seen a person at the site of a car fire where her body was found.
Miss Wells-Burr's Ford Focus was discovered on fire in a lane at Ashill near Ilminster on the morning of Wednesday, September 12.
The 23-year-old, from Chard, was found inside.
In a new development, the man leading the investigation into her death has renewed his appeal for information after receiving reports of a person seen near the site of the fire, just off the A358.
Detective Chief Inspector Simon Crisp said: "I am extremely keen to speak to anyone who saw a person at the site of the car fire in which we discovered Catherine's body.
"This person was in the area before the fire was lit, and was seen to then walk along the left hand verge towards Taunton immediately after.
"It is imperative that we speak to anyone who saw this person, before or after the fire, or if you are that person please come forward and speak to us."
Rafal Nowak and Anna Julia Lagwinowicz have both been charged with conspiracy to murder and remanded into custody.
Both are due to appear at Bristol Crown Court on Tuesday, October 9.
A 38-year-old man remains on police bail.
Anyone with information should call police on 101, or via Crimestoppers anonymously on 0800 555 111.