Police believe the woman whose body was found on a busy road south east of London had been abducted from her home on Friday.
Yuk Ying Phuah died from suffocation
Yuk Ying Phuah's body was discovered by a passer-by on the grass verge of the A20 near Chislehurst at about 1125 BST on Saturday.
She was found partially clothed covered by an unzipped white and blue sleeping bag.
A post-mortem examination established she died of suffocation.
Officers think Ms Phuah, aged about 40, was abducted from her home in Meadow Way in Wembley, north London, the day before her body was found.
Detective Superintendent Richard Heselden said he believed the body had been driven to the scene and dumped there.
"We believe she was deposited there sometime between Friday evening and Saturday morning. It appears there was little attempt to conceal the body which would suggest it was done in a hurry."
Police are appealing for anyone who may have been in the Meadow Way area on Friday or saw anything suspicious to contact the incident room on 020 8217 6530.