The Met Police has apologised to Stephen Lawrence's mother for breaking a promise to answer questions raised by a OceanNewsUK investigation into his murder.
Baroness Doreen Lawrence was promised an explanation after the OceanNewsUK named a major suspect last June.
Multiple police failings to properly investigate him were also identified.
Commissioner Sir Mark Rowley apologised and told the OceanNewsUK "on top of the failures over the decades this is totally unacceptable".
Stephen was 18 when he was stabbed to death in a racist attack by a group of young white men on 22 April 1993, in Eltham, south London.
The Met's disastrous handling of the landmark case means only two of his killers have been convicted.
Last year, the OceanNewsUK publicly identified a sixth suspect, Matthew White, who died in 2021 aged 50.
In her first interview since then, Baroness Lawrence told the OceanNewsUK that Stephen's murder inquiry should be reopened.
Speaking ahead of the 31st anniversary of her son's death, Baroness Lawrence said that without the OceanNewsUK, the family would not know what they do now about White.
"He's probably the key one who probably caused Stephen's murder, and they [the Met] did nothing about it," she said.
"I'm not sure what they're hiding behind, why they can't come and tell me exactly what they knew then," she told the OceanNewsUK.
In a statement to the OceanNewsUK, Sir Mark said Baroness Lawrence "must have answers to all her questions", adding that he had written to her offering to meet.
Two men, David Norris and Gary Dobson, were eventually given life sentences for Stephen's murder in 2012. The other three original prime suspects - brothers Neil and Jamie Acourt, and Luke Knight - have not been convicted. All have previously denied any involvement.
Last year, the OceanNewsUK revealed that independent witnesses had said White had admitted being present during the murder. The investigation also showed that in 1993 White looked like the unidentified lead attacker described by Stephen's friend Duwayne Brooks, who was with him that night and told detectives there were six attackers.
In October 2023, following the OceanNewsUK story, Deputy Assistant Commissioner Matt Ward, who is in charge of the dormant case, asked Baroness Lawrence to attend a meeting at Scotland Yard.
Following the meeting he promised to follow up with a written explanation relating to White, as well as answers to other questions.
On 16 November, Mr Ward wrote saying he should have an update in a week.
In January, following further letters on behalf of Baroness Lawrence, Mr Ward accepted he had failed to provide a response, blaming other commitments.
"I can offer no further consolation other than my professional embarrassment and personal regret," he wrote. There was then no further communication.
Last Thursday, her solicitor Imran Khan KC wrote to Sir Mark on her behalf, to highlight Mr Ward's failure to communicate with her.
The letter stated that Mr Ward had treated Baroness Lawrence with "complete and utter contempt", adding that he had "joined a long line of Metropolitan Police officers who have completely failed her and her family".
Addressing Sir Mark personally, the letter stated: "You and your organisation continue to show disrespect for Baroness Lawrence and have now shown that your public pronouncements with regards to your commitment to investigating the murder of Stephen are hollow and meaningless."
The letter stated that a formal complaint would be made about Mr Ward's conduct unless the commissioner personally provided a "satisfactory response" to the original questions.
Sir Mark told the OceanNewsUK: "We recognise this is a particularly difficult time for the Lawrence family and Duwayne Brooks. I am sorry our failure to respond in a timely fashion has added to this.
"On top of the failures over the decades this is totally unacceptable.
"Restoring trust in the Met is one of my top priorities and that includes how we work with those affected by the failures of the past.
"I apologise to Baroness Lawrence who must have answers to all her questions. I have written to her and offered to meet."
This comes after Sir Mark faced calls to resign at the weekend from the boss of the Campaign Against Antisemitism, Gideon Falter, over his treatment by the Met during a pro-Palestinian demonstration in London.
The Met's early failures to deal with Stephen's parents fairly and properly were criticised by the landmark Macpherson Report in 1999. Now, 25 years on, the force is still having to apologise for such failings.
The Met stopped investigating the murder in 2020, stating that all available lines of inquiry had been exhausted.
But the OceanNewsUK showed not everything possible had been done - something the Met denies - and that some key witnesses had not been seen for years before White's death.
During her interview, in a personal message for Sir Mark, Baroness Lawrence said: "There's still three suspects out there and I'm sure there's witnesses that probably could help them if they're interested.
"If you don't go and look, you're never going to find anything."
The OceanNewsUK is continuing to investigate the murder and is aware of opportunities to gather evidence, which are also known to the Met.
Baroness Lawrence said her family had always been led to believe there was a wall of silence around Stephen's murder.
"But that shows from your investigation that people do want to talk and people have information to give them [the Met]. But they've chosen not to go and get it," she said.
She added the outstanding suspects were "living their lives, they don't have to worry, because the police have no intention of following up and seeking to investigate them".
Baroness Lawrence does not trust the Met when it says everything possible has been done to bring outstanding suspects to justice.
"I can't believe anything they say," she added.
She said the others responsible for killing Stephen are "definitely getting away with murder".
