Police say they are re-examining evidence in the murder of a teenager in Liverpool city centre.
Andrew Jones died after being punched in Liverpool city centre
Andrew Jones, 18, banged his head on the ground when he was punched in a scuffle outside a nightclub in March 2003. He died a day later.
A man was charged with manslaughter but the case was thrown out of court after three days because of lack of evidence.
Merseyside Police say advances in technology and forensics may provide more avenues for them to explore.
Chief Constable Bernard Hogan-Howe said: "Andrew Jones's family have been through an extremely harrowing experience, both in terms of losing their son and then left feeling that justice hasn't been done.
'Years of hell'
"I also know the investigating team, who carried out a thorough and professional inquiry, shared the family's bitter disappointment."
Andrew's father, also called Andrew, welcomed the police decision.
"We're just made up that something is finally happening after two years of hell," he said.
"We've been calling for this to happen and now we feel vindicated."