Detectives from Merseyside Police say there has been a positive response from the public following an appeal on Crimewatch.
Officers appealed for information on Thursday night to help them solve the Anthony Cavanagh murder investigation.
They answered the phones in the BBC studio and said they had fielded at least 15 calls and a number of text messages related to this case by the end of the night.
Det Chief Insp Tim Keelan said: "We have received a very positive response from the public following the Crimewatch appeal.
"Out of those, we had one really important one from someone calling us anonymously with information about who may have thrown the punch and we also received a text message providing us with names of who was there when Anthony was attacked.
"We really need to speak to both those people again so I would appeal for them to re-contact us as their information may be crucial to bringing those responsible for Anthony's death to justice.
"It was a very encouraging response and I would like to thank the public for contacting us and would urge anyone else who has information to contact the incident room on 0151 777 4064 or Crimestoppers on 0800 555 111."
Anthony was assaulted in a Liverpool city centre bar in the early hours of Saturday September 24 2005.
He died 11 days later in hospital, on the day after his 22nd birthday.
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