The man who was initially identified as the London terror attacker is still in prison, according to his solicitor.
Abu Izzadeen, also known as Trevor Brooks, was killed in the security response.
A police officer was stabbed to death in the attack.
In November 2015 police stopped Abu Izzadeen at the Hungarian border town Lokoshaza on a train destined for Romania, raising concerns he may have been trying to reach Syria.
Izzadeen was travelling with another known British extremist, Simon Keeler, despite the fact that both them are subject to a travel ban that prevents them from leaving the country.
In 2008 the pair were jailed for inciting terrorism abroad and terrorist fundraising.
Izzadeen was born to a Christian Jamaican family in Hackney, but converted to Islam aged 17.
In 2006 he gained notoriety for heckling the then Home Secretary, John Reid, during the minister’s speech at a Leytonstone school.
The Muslim activist is thought to have been radicalised by Omar Bakri Mohammed and Abu Hamza at Finsbury Park mosque.