Police want to speak to this man in connection with a sexual assault in Milton Keynes in July.
Shortly after 10.20pm on July 16, a 17-year-old girl got off a train in Bletchley with a man and walked with him to Tinkers Bridge.
As they walked along the redway, the man kissed the girl on the neck and touched her inappropriately.
She pushed him away and flagged down a member of the public in H9 Groveway.
Officers would like to speak to the man in the CCTV, as he may be able to help with enquiries.
The man in the image is white, around 5ft 6ins tall, with short light-brown hair. He was wearing a polo shirt, jeans and white Lacoste-type shoes.
Anyone with information is asked to contact investigating officer PC Sarah Lucas from Milton Keynes Force CID on 101.