London terror attack killer Khalid Masood was born Adrian Elms in Kent
The London terror attack Khalid Masood carried out was the end point of his evolution to extremist from the boy born in Kent and named Adrian Elms.
He spent years moving round the country – and the prison system – with a host of different identities.
He was born to a single mother as Adrian Elms, but after a religious conversion years later, also called himself Khalid Choudry.
Now I'm scared that someone like that was living close to me
Iwona Romek, neighbour
His criminal career dated back to 1983 and included convictions for assault, GBH and possession of an offensive weapon.
This led him to spend time behind bars at Lewes Prison in East Sussex, Wayland Prison in Norfolk and Ford open prison in West Sussex.
But he would later mask his life of crime with a CV which claimed he was an experienced English teacher who had worked across the world.
The document, seen by The Sun, lists Masood as a university-educated English teacher with experience working in places such as Saudi Arabia and Luton.
It is understood he never worked as a teacher in any of England's state schools.
When he died on the cobbles outside Parliament, he reportedly left behind three children and a wife.
The killer most recently appeared to be based in the West Midlands, but also spent time in London, Sussex and Luton.
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After his armed onslaught on Wednesday, police searched a three-storey townhouse in the Winson Green area of Birmingham and neighbours said Masood lived there for around seven months until December last year.
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Conservative MP Tobias Ellwood (centre) helps emergency services attend to a police officer outside the Palace of Westminster, London
Iwona Romek said she could not believe her eyes when she realised the man who had lived near her was the same person responsible for the attack.
She told the Press Association: "Now I'm scared that someone like that was living close to me."
Ms Romek said she had seen him with a child aged between five and six and a partner, but that they had moved away around two to three months ago.
Armed police also raided a flat in another part of the city, storming the second-storey property in Hagley Road overnight.
Masood carried out the attack with a rental car at Westminster bridge before stabbing an officer
Stunned residents described seeing more than a dozen black-clad officers equipped with machine guns smashing their way into the Birmingham flat, believed to be a rental, at about 11pm on Wednesday.
One resident said he recalled two men living there.
He heard one man in the flat speaking on the phone in what he described as an "Arabic or Pakistani accent", saying he had heard it "for the last two or three nights".
Five people were killed in the London terror attack
Police have raided properties in Birmingham
Masood is also thought to have lived in London, with a man of his name registered to an address in a terraced street in West Ham.
A neighbour, who asked not to be named, said: "This guy is a local guy. I've been living in the area for 20 years.
"I don't know him personally but I believe he belongs to a mosque on Leyton High Road."