Thames Valley Police is releasing an E-Fit image of a man they would like to speak to in connection with an armed robbery in Milton Keynes.
At around midnight on Saturday 16 February the victim, a 50-year-old man, was walking through Shenley Brook Recreation Ground when he was approached by a man on a grey mountain bike.
The offender threatened him with a gun, telling him to hand over his wallet.
The victim handed over his wallet and the offender cycled off in the direction of Church End Road.
The person depicted in the E-Fit image is white, between 30 and 40 years old, around 6ft tall, of medium build with a tear-drop tattoo on the right side of his face.
He was wearing a black tracksuit with a white stripe down the side, a black hat, white trainers and a gold chain around his neck. He also spoke with an Irish accent.
Investigating officer, Detective Sergeant Kirsty Bishop, based at Milton Keynes police station, said: “We are releasing the E-Fit image of this man in the hope that someone may be able to identify him.
“We would also like to speak to anyone who may have witnessed the incident.
“Alternatively, you can contact Crimestoppers anonymously on 0800 555 111.”