Anyone with any information about the incident should contact Det Sgt Homes via the 24-hour Police Enquiry Centre on 101.
If you don't want to speak directly to the police, you can contact the independent charity Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org. No personal details are taken, information is not traced or recorded and you will not go to court.
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The family of a Sussex teenager who died after just one punch during a night out has reached a milestone in their lifesaving campaign.