Detectives investigating the suspected murder of Naheed Khan, 43, have released images of a vehicle they are appealing for information on.
Police believe Ms Khan may have travelled in the vehicle at the end of April/early May 2018, shortly before she disappeared on the early May bank holiday weekend.
The vehicle police are investigating is a light blue Ford Focus - registration MX02 CVU - which was recovered by officers in January 2019 in Middlesbrough.
It has a distinctive white sticker of a vehicle on the rear boot panel which reads 'Paul Walker one last ride'.
Police believe the car may have been up for sale in June 2018 at the junction of Sedgemoor Road and Holmefields Road in Middlesbrough and it was possibly sold to someone on Falmouth Street in the town.
Senior investigating officer, detective chief inspector Mark Dimelow said: "We have carried out extensive enquiries since we recovered the vehicle and there are still a few gaps we need answers to regarding the vehicle's movements between May 2018 and January 2019.
Do you recognise the vehicle? Do you know someone who has owned it or have you ever seen Naheed inside of the vehicle? If you do recognise the Ford Focus, or, if you have been offered it for sale, particularly during the period of May 2018 to January 2019, please contact us with further information.
"Prior to the vehicle being recovered it is believed it had spotlights and further stickers on the front of it. We have also received information to suggest the car was up for sale in the Grove Hill area."
Ms Khan, also known as Nad, had links to the Stockton, Middlesbrough and Thornaby areas. She is described as Asian, of slim build and around 5ft 6" tall with long, dark hair.
A 39-year-old man was arrested in connection with the disappearance of Naheed and released under investigation pending further enquiries.