Thames Valley Police is releasing the E-fit of the offender in a sexual assault investigation in Amersham
At around 10.30pm on Saturday 6 May, a woman was walking along Elizabeth Avenue when a man approached her and started to talk to her.
The woman moved out of his way so he could pass, and he then touched her inappropriately.
The victim shouted at offender and ran away to safety.
Investigating officer PC Jakub Szczupalkiewicz, based at Aylesbury police station, said: “We are releasing an E-fit of the offender in this sexual assault.
“If anyone recognises the person in the E-fit, please contact the police as soon as you can. You can come into a police station, leave any information you have on our website or call 101, quoting investigation reference 43230198566.
“Or if you do not wish to speak to police you can contact the independent charity Crimestoppers on 0800 555 111.”