The Independent Police Complaints Commission (IPCC) has examined Met Police Assistant Commissioner Andy Hayman's role in the aftermath of the shooting of Brazilian Jean Charles de Menezes at Stockwell Tube station on 22 July 2005.
Mr Hayman apologised to Forest Gate residents
The UK's most senior counter-terrorism officer had been accused of failing to tell the commissioner at the earliest opportunity after the 27-year-old was mistakenly shot dead by officers of his suspicions an innocent man had been killed.
The IPPC investigation is not the first storm Mr Hayman has had to weather since his appointment as head of counter-terrorism in 2005.
Following the widely criticised Forest Gate anti-terrorism raid, Mr Hayman apologised to two brothers released without charge following the operation. Days later he was awarded a CBE, prompting further anger.
During the Forest Gate raid, about 250 officers stormed the home of Mohammed Abdulkahar, 23, and Abul Koyair, 20.
Mr Abdulkahar, who was shot in the shoulder, said he had thought he was going to be killed by robbers targeting his home.
7 July praise
The brothers were questioned under anti-terrorism laws for a week before being freed without charge.
Mr Hayman, who has won praise for his response to the 7 July attacks, joined Essex Police in 1978 and first served as a uniformed officer with the force's CID.
When he was appointed commander in the Met Police in 1998, he lead Operation Trident, the capital's gun crime and drug-related murders unit.
Mr Hayman was appointed chief constable of Norfolk Constabulary in 2002. In June 2004 he was awarded the Queen's Police Medal.
While in Norfolk he was also elected the chairman of the Criminal Justice Board, a role he retained until returning to London to take up his current position.
Mr Hayman is also chairman of the Association of Chief Police Officers (Acpo) drugs committee, a member of the Advisory Council for the Misuse of Drugs, and chairman of the Acpo Media Advisory Group.