An independent review into the Metropolitan Police’s investigation of the 1993 murder of Stephen Lawrence has begun, and his mother, Baroness Doreen Lawrence, has urged anyone with information to come forward.

The College of Policing said the review, commissioned by the Metropolitan Police, will examine evidence the force holds and seek any outstanding lines of inquiry that could reasonably lead to a suspect being brought to justice. Assistant Chief Constable Tom Harding, director at the College, said a team of leading professionals would “undertake an independent review focusing on finding any outstanding lines of enquiry.”

Baroness Lawrence, who was ennobled for her campaigning after her son’s death, told the BBC the review represented “the last opportunity” to secure “the complete justice that I think Stephen so deserves.” She appealed directly to people who might have tried to help at the time or who have held back information, saying: “Please come forward now.”

Stephen Lawrence, an 18-year-old Black teenager, was fatally attacked in Eltham, south-east London, in April 1993 in what prosecutors and campaigners have long characterised as a racist killing. The case prompted inquiries into institutional failings at the Metropolitan Police and a prolonged public campaign for justice. Two of the five main suspects were convicted in 2012 — Gary Dobson and David Norris — following a long-running legal and public campaign that included sustained media attention.

The Metropolitan Police said its objective remained “to achieve the arrest, prosecution and conviction of all of those responsible for Stephen’s murder.” A force spokesman said the review will be led by an experienced investigator working for the College and is committed to identifying any outstanding opportunities to bring further suspects to justice. If the review identifies viable lines of inquiry from witnesses or newly considered evidence, those leads will be referred to the police for action.

Scotland Yard formally closed its active investigation into the case five years ago, according to accounts from campaigners, but the new review is intended to re-examine material in the force’s possession and test whether any avenues remain that could reasonably be pursued. The College of Policing said the review team would be independent and draw on experienced investigators to ensure thorough scrutiny.

Baroness Lawrence said the Lawrence family had not been allowed to grieve in private because the fight for justice continued for more than three decades. The review marks a renewed official effort to determine whether there are actionable leads that could result in further arrests or prosecutions, and officials encouraged anyone with relevant information to contact the authorities so it can be assessed by the review team and, if appropriate, referred to investigators.