Officers have now released pictures of two witnesses who may have seen the 38-year-old before she disappeared in the centre of Edinburgh last May.
They are urgently trying to trace the pair, who may have been among the last people to see Ms Pilley alive.
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The bookkeeper lived in the Stenhouse area of Edinburgh, and is thought to have been murdered at her office in Thistle Street.
The two witnesses – a man and a young woman – were caught on CCTV around the time Ms Pilley went missing. They are not believed to be suspects, but may be able to provide vital information to help the murder investigation.
The missing woman’s ex-boyfriend, David Gilroy, 47, has been charged with her murder but released on bail. Her body has not been found, though police have searched an area of Argyll where she is thought to have been buried.
Detectives investigating the disappearance of an Edinburgh woman are hunting two new witnesses as it emerged further searches of remote forest and mountainside have been carried out for her missing body.
Fresh CCTV images were released yesterday of a man and woman who police say may have any information that could help the probe into the disappearance of Suzanne Pilley, thought to have been murdered. The two are not believed to be suspects in the case.
Ms Pilley, a 38-year-old bookkeeper from the Stenhouse area of Edinburgh, vanished on her way to work in the city centre in May last year.
David Gilroy, 47, is on bail after being charged with her murder, although her body has never been found.
The pictures released yesterday are of two people seen in the capital’s Thistle Street on May 4, the day Ms Pilley was last seen.
Lothian and Borders Police said the first person being sought is a slim woman aged 18 to 30, with long dark hair which was tied up.
She was wearing a black-and-white scarf around her neck, a black waist-length jacket, a short skirt, grey tights and black knee-length boots. The woman was also carrying a bag over her right shoulder and entered Thistle Street from Hanover Street.
Police said there is a chance she may have been walking to a small blue car, possibly a VW Polo, which was driven off around the same time. It is thought the car may have had a near miss with a bus on South St David Street moments later.
The man being sought is aged between 20 and 40. He has short dark hair and a medium build.
He was wearing a brown waist-length jacket and blue jeans and was carrying a small green plastic bag, possibly from Marks & Spencer. Officers said he walked along Thistle Street and went into Prospect House at 5 Thistle Street.
The development came as it emerged that officers have been carrying out localised searches where detectives believe Miss Pilley’s body is hidden, taking advantage of seasonal changes in the landscape in the hope that new clues may be revealed.
A two-day search involving 70 volunteers and rescue dogs focused on sections of an eight-mile stretch of Glen Croe in the Argyll Forest last August.
The police source said: “We still continue to search for Suzanne’s body, and will continue too pursue any lines of inquiry that may help with that search as they emerge.”
On the CCTV film, Detective Chief Inspector Gary Flannigan yesterday urged people to study the fresh images. He said: “Please take time to look carefully at these images. Do you recognise yourself or a friend?
“It is very important that we speak to these people in order to determine that they have no additional information to offer the inquiry.”