A man suffered a fractured skull in an attack on a busy street in Sheffield city centre.
The 18-year-old was attacked on West Street at 3am on Tuesday, October 9 but details of the incident have only been released by South Yorkshire Police today.
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Detectives have CCTV images of a man they believe could hold vital information about the attack.
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Witnesses or anyone who recognises the man in the CCTV should call South Yorkshire Police on 101 and quote incident number 60 of October 9.
Crimestoppers can also be contacted, anonymously, on 0800 555111.