An engaged couple, killed while walking along the busy A47 asked staff at a local business to call police shortly before they died.
Detectives investigating the deaths believe the 24-year-old woman may have been pushed into the path of the traffic.
The couple have been identified as Tadas Zaleskas, 26, and part-time beautician Nonita Karajevaite, both from Lithuania.They lived at Church Road in Emneth and were factory workers.
This week police were still trying to piece together their movements up to the collision with a silver Kia car at 2.15pm on Sunday on the east-bound carriageway at Terrington St John.
Detective Chief Inspector Paul Durham said Miss Karajevaite’s death was being treated as suspicious after witnesses said she may have been pushed.
The couple had been walking barefoot for several miles along the busy road and were wearing distinctive clothes.
So far, the earliest sighting police have was at 12.30pm on the Elme Hall roundabout near Wisbech.
The couple stopped at Worzals farm shop at Walton Highway at 1.20pm where they both independently asked staff to call the police.
Detetive Chief Inspector Durham said the woman asked for help first, then the man came in and they spoke to each other in a foreign language before he asked for the police to be called.
The police chief said the conversation was not heated and staff tried to find out why they needed help.
They left before police were called and were spotted by other witnesses walking along the verge heading towards King’s Lynn just before the accident.
“They would have posed an unusual sight – the woman wearing a bright pink vest-top and the man in designer-style jean shorts – both walking barefoot along one of our busiest trunk roads on one of the hottest days of the year.
“We need to find out how and why this tragedy occurred and I would urge anyone who thinks they may have seen them in the area, at any time on Sunday morning, to come forward,” said the Det Ch Insp.
Mr Zaleskas is described as 6ft 1ins tall, of slim build with short dark hair. He wore blue denim knee-length shorts and a grey T-shirt.
Miss Karajevaite was 5ft 7ins tall, of slim build, with long hair. She wore a bright pink top and black rolled-up trousers.
Both died as a result of the injuries sustained.
“We are asking people to cast their minds back. We are keen to hear from any witnesses who saw them or witnessed the crash.
“Also, we need to speak to people who were in Worzals at 1.20pm who saw them before, inside the shop and afterwards,” said Det Ch Insp Durham.
Part of the A47 was closed on Wednesday while specialist teams searched the roadside and found some personal items believed to have belonged to the couple, including clothing and documents.
If you have any information call police on 101 or Crimestoppers on 0800 555111.