The barrister who represented Stephen Lawrence's family said allegations of police corruption could be "potentially extremely significant" to the unsolved case.
Michael Mansfield QC said the claims made in a BBC documentary, shown last night, should be pursued, either by the Independent Police Complaints Commission or the Metropolitan Police.
And he said Mr and Mrs Lawrence had accused the the police of racism and corruption from the start.
Stephen, an 18-year-old A-Level student, was stabbed to death in an unprovoked race hate attack by a gang of five white youths in April 1993.
A bungled police investigation of the case followed.
No one has been convicted of the killing but five men - Neil Acourt, his brother Jamie, David Norris, Gary Dobson and Luke Knight - were arrested soon after the event.
Three of the men were acquitted of murder after a private prosecution brought by the Lawrence family collapsed at the Old Bailey in 1996.
The BBC1 documentary The Boys Who Killed Stephen Lawrence alleges that police corruption may have prevented Stephen's killers being brought to justice.
It interviews former corrupt detective turned whistleblower Neil Putnam who claims that former detective sergeant John Davidson - now running a bar in Spain - was paid by the father of one of the prime suspects to obstruct the case.
Mr Putnam said Mr Davidson was receiving a "nice little earner" from Clifford Norris, the gangland father of David Norris, to put him one step ahead of the investigation.
Mr Davidson has always denied this allegation.
Dr Richard Stone, a panel member of the Stephen Lawrence Inquiry, said the documentary's allegations were "remarkable" but did not surprise him.
"Sir William (Macpherson) himself had said at the time of the inquiry that there was a definite smell of corruption around this murder investigation - what he described as the collective failure of the murder investigation."
Home Secretary John Reid described the documentary as "disturbing".
He said it was important for the Lawrence family and for the reputation of the police that the allegations were "cleared up" and that whoever was responsible for Stephen's murder was brought to justice.
Scotland Yard insisted last night that despite an "in-depth" corruption investigation into Mr Davidson, there was never any evidence of misconduct. Len Duvall, chair of the Metropolitan Police Authority, said he had "serious concerns" about the film.