The police are asking anyone who witnessed an unprovoked assault in Worthing to come forward.
The assault occurred on Chatsworth Road at around 3 am on December 23rd and left a 29-year-old victim with serious injuries.
Detectives have released an image of a man they want to speak to.
If you have any information regarding the assault or recognise the man in the photo, please report it to Sussex Police online or by calling 101.