A Chinese restaurant owner has been found dead after returning home with the day's takings.
Ms Chung was found dead in her home in Hillingdon
Kam Fum Chung, 65, known as Helen, was discovered by a family member at her house in Hillingdon, west London.
She suffered extensive face and chest injuries caused by a blunt weapon, a post-mortem examination found.
Police said there was no sign of forced entry, but her silver VW Golf was missing as well as the Mandarin Restaurant's receipts.
Police believe the vehicle was taken from the address in Meadowview, Cowley, some time after Ms Chung got in about 0030 GMT on 6 November.
The vehicle was recovered burnt out approximately four miles away in Denham, Buckinghamshire, the following day.
Det Ch Insp Steven Lawrence said: "It's vitally important that we trace who was driving it and may have carried out this horrific attack."
He said the car's plates may have been changed but it was distinctive due to a damaged wing mirror on the driver's side which was taped up.