The man seen wielding a bloodied knife and ranting into a witness’s video phone after the Woolwich attack on a soldier has been named as Michael Adebolajo.
His identity has not been formally released, but emerged on internet forums and Twitter hours after the soldier was butchered on a busy London street.
Born in the London borough of Lambeth, the suspect is said to have gone to school in Romford, Essex, before studying at the University of Greenwich.
He lived in two flats in the Greenwich area of London in 2004 and 2005, while his mother is believed to have moved to Lincolnshire at some stage.
Adebolajo is known to have been a preacher on the streets of Woolwich and is understood to have run an occasional stall in the area, from which he distributed extremist literature condemning the involvement of British soldiers in Iraq and Afghanistan.
The Metropolitan Police today raided a home in Lincolnshire believed to belong to a relative of the 28-year-old.
Officers are also understood to have carried out searches at addresses connected to Adebolajo in Romford, Essex.
A man believed to be Adebolajo speaks with a London accent in the video footage and is believed to be a British citizen of Nigerian descent.
Both he and the other suspect in the Woolwich murder are thought to have converted to a radical form of Islam.
They are not thought to have links to terror groups based in Nigeria, such as the jihadist organisation Boko Haram, however.
Adebolajo was reportedly known to Al Muhajiroun, the banned Islamist organisation, and went by the name of Mujahid.
Anjem Choudary, the former leader of the group, confirmed he had known him, The Independent reported.
He claimed he had converted to Islam in 2003 and had stopped attending meetings of Al Muhajiroun and its spin-off groups two years ago.
He said he had also known “Mujahid” as Michael.
Lincolnshire Police confirmed that a property in the East Midlands county had been searched in connection with the murder.
While the two self-confessed killers were under armed guard in different London hospitals, detectives swooped on an address in the village of Saxilby, some 150 miles from the murder scene.
The property being searched was a £365,000 detached house, where Adebolajo is listed as having previously lived.
There were also reports of addresses in the London area being searched by police, including one in Greenwich.
Scotland Yard refused to comment, but Lincolnshire Police said: "We can confirm that the Metropolitan Police executed a search warrant under PACE (Police and Criminal Evidence Act) at an address in Lincolnshire.
“This is in connection with the ongoing investigation into the murder of a man in Woolwich. The Metropolitan Police are not prepared to discuss the matter further at this stage."