The head of Scotland Yard will be grilled today by MPs over shocking findings in the Stephen Lawrence independent review.
Metropolitan Police Commissioner Sir Bernard Hogan-Howe will appear before the Home Affairs Select Committee to face questions over Mark Ellison QC's review.
Mr Ellison's report, published earlier this month, found that an undercover police officer was working within the ''Lawrence family camp'' in the late 90s as evidence was being taken for the judicial inquiry led by Sir William Macpherson into Stephen's death.
Stephen, 18, a would-be architect, was stabbed to death by a group of up to six white youths, in an unprovoked racist attack as he waited at a bus stop in Eltham on April 22 1993. It took more than 18 years to bring two of Stephen's killers to justice.
In the wake of the Ellison Review's publication, Commander Richard Walton was temporarily removed from his post as head of the Met's counter-terrorism command SO15 o ver his links to the undercover operations.
An undercover officer - known as N81 - held a meeting in 1998 with Mr Walton, who was then an acting detective inspector working on Scotland Yard's Lawrence review team, responsible for making submissions to the Macpherson Inquiry.
Feedback from N81 touched on personal details concerning the Lawrence family, such as comments on the separation of Stephen's mother and father, Doreen and Neville.
N81 and Mr Walton's meeting was described as a ''fascinating and valuable exchange of information'' in police notes.
In addition, Mr Ellison found there is evidence to suspect one of the detectives on the original Stephen Lawrence murder investigation - detective sergeant John Davidson - acted corruptly.
It was claimed that he had links to Clifford Norris, the gangland boss father of David Norris, one of the two men who were finally convicted in 2012 of the teenager's racist murder.
Sir Bernard has previously said he will ''assist in any way possible'' with any further investigation into the claims. He plans to appoint an independent investigator to search Met archives to try to find any available evidence for the public inquiry into undercover policing.
Home Secretary Theresa May announced a judge-led public inquiry will be launched into the work of covert police and Scotland Yard's Special Demonstration Squad (SDS) - the top secret undercover policing unit that was up and running for nearly 40 years.