Germaine Lindsay, the only one of the four 7 July London suicide bombers to be born outside the UK, was thought to be the "outsider" of the group.
Lindsay converted to Islam and changed his name
After spending the first year of his life in Jamaica, where he was born, Lindsay moved to the UK with his mother in 1986.
The family settled in Huddersfield in West Yorkshire - thought to be the place where Lindsay met fellow bomber Mohammad Sidique Khan.
In his early life, Lindsay was described as a bright child, successful at school and good at sport.
But his home life was not so stable. His natural father remained in Jamaica and appears to have played little role in his life.
His mother moved in with another man, who was a harsh stepfather to Lindsay.
By 1990, that relationship dissolved and Lindsay's mother moved in with another man.
Lindsay was much closer to his second stepfather, who remained with the family until 2000.
He was thought to be artistic and musical and during his teenage years he became interested in martial arts and kickboxing.
The year 2000 represented a watershed in Lindsay's life - as both he and his mother converted to Islam. He took the name Jamal.
At around the same time, he started to associate with troublemakers and was disciplined at school for handing out leaflets in support of al-Qaeda.
In Islamic groups around Huddersfield and Dewsbury, he was admired for the speed with which he achieved fluency in Arabic and memorised long passages of the Koran, showing unusual maturity and seriousness.
It is thought Lindsay was influenced by extremist preacher Abdallah al-Faisal, a fellow Jamaican, now serving a prison sentence for soliciting murder and race hate.
Sept 1985: Born in Jamaica
1986: Moves to UK with mother
2000: Converts to Islam
2004: First child born
May 2005: Rents bomb factory
June 2005: Recce visit to London
7 July 2005: Bombs Tube train near King's Cross, killing 26
Source: UK government
A further rupture in Lindsay's home life took place in 2002, when his mother moved to the US to live with another man, leaving him alone at the family home in Huddersfield.
It was thought to be a traumatic experience for Lindsay, one he was ill-equipped to deal with.
He left school, lived on benefit, and did odd jobs selling mobile phones and Islamic books.
He married Samantha Lewthwaite, a white British convert to Islam he had met on the internet and later at a Stop the War march in London, on 30 October 2002.
They lived initially in Huddersfield but moved to Aylesbury in Buckinghamshire, where his wife's family lived, in September 2003. Six months later, their first child was born.
While in Aylesbury, Lindsay worked as a carpet-fitter, a job he had obtained with the help of his brother-in-law, although by the time of the bombings he was unemployed.
Although it is not clear when Lindsay met Khan, both were active in Islamic circles in the Huddersfield and Dewsbury areas.
They were certainly close associates by the latter half of 2004.
On 7 July last year Lindsay boarded a Piccadilly Line train at King's Cross. Shortly afterwards he detonated a bomb, killing himself and 26 others and injuring more than 340.
Following his death, his wife gave interviews where she apologised for the actions of Lindsay, describing him as a "loving husband and father".
"My whole world has fallen apart and my thoughts are with the families of the victims of this incomprehensible devastation."
Since his death, Ms Lewthwaite has given birth to Lindsay's second child - a daughter.