Detectives investigating a sexual assault on a 19-year-old woman earlier this year said they have a full DNA profile of the suspect.
A man forced the woman into a field and attacked her as she walked along Newmills Road in the Balerno area of Edinburgh in August.
Details of the investigation are being featured on the webpage of BBC's Crimewatch programme following Monday night's show.
Detective Inspector Grant Johnston said: "We are hopeful that the Crimewatch appeal will help jog people's memories and result in a vital piece of information.
"Anyone who believes they have information that could assist with our ongoing inquiries is asked to come forward immediately."
The attack happened at about 12.30am on Thursday August 27 when the teenager was threatened before being subjected to a serious sexual assault.
The man is described as white with a slim build, around 6ft and possibly has long hair. At the time, he was wearing a grey hoodie and dark jeans. He may also speak with an Edinburgh or English accent.
Police said they are also looking to trace the occupants of a light coloured five-door saloon car as potential witnesses. The vehicle was seen a short time before the incident near the railway line further down Newmills Road towards Gowanhill Farm Road.
Why are you making commenting on The Herald only available to subscribers?
It should have been a safe space for informed debate, somewhere for readers to discuss issues around the biggest stories of the day, but all too often the below the line comments on most websites have become bogged down by off-topic discussions and abuse.
heraldscotland.com is tackling this problem by allowing only subscribers to comment.
We are doing this to improve the experience for our loyal readers and we believe it will reduce the ability of trolls and troublemakers, who occasionally find their way onto our site, to abuse our journalists and readers. We also hope it will help the comments section fulfil its promise as a part of Scotland's conversation with itself.
We are lucky at The Herald. We are read by an informed, educated readership who can add their knowledge and insights to our stories.
That is invaluable.
We are making the subscriber-only change to support our valued readers, who tell us they don't want the site cluttered up with irrelevant comments, untruths and abuse.
In the past, the journalist’s job was to collect and distribute information to the audience. Technology means that readers can shape a discussion. We look forward to hearing from you on heraldscotland.com
Comments & Moderation
Readers’ comments: You are personally liable for the content of any comments you upload to this website, so please act responsibly. We do not pre-moderate or monitor readers’ comments appearing on our websites, but we do post-moderate in response to complaints we receive or otherwise when a potential problem comes to our attention. You can make a complaint by using the ‘report this post’ link . We may then apply our discretion under the user terms to amend or delete comments.
Post moderation is undertaken full-time 9am-6pm on weekdays, and on a part-time basis outwith those hours.
Read the rules here