Abu Khalid al-Britani killed at least 50 Iraqi soldiers in a double suicide bomb attack with a Tunisian fighter whilst defending Ramadi.
A photograph was posted online in tribute to the British fighter, who was half Yemeni and half Somali in origin but never lived in Somalia.
Another fighter known as Abu Maidah as-Somali, who used to live in London and Sweden, described the dead jihadi as his 'best friend'.
Abu Maidah revealed that the British suicide bomber was in his 40s and was not fluent in Somali.
The two fighters met in a terrorist training camp before Abu Khalid volunteered to fight in Iraq.
Abu Khalid al-Britani is the third British fighter to blow himself up at Ramadi whilst fighting for ISIS.
Earlier this week, ISIS released a statement claiming that a British fighter called Abu Omar al-Britani had taken part in a twin suicide bomb attack, killing and wounding 80 people.
The attack was carried out as Iraqi Special Forces launched a large offensive to try to re-take the ISIS held city.
A photograph showed the British fighter sitting behind an office desk in Anbar province. The fighter is dressed in a white thobe and has chunky gold watch on his wrist.
His large framed glasses poke out above the black mask which covers half of his face.
In what appears to be an office, the fighter has a large knife, a single green hand grenade and a pistol placed in front of him on the work top.
A single copy of the Qu'ran rests next to a laptop as the jihadi poses with his gloved index finger pointed up to the sky to show his oneness with God.
The rise in British suicide bombers at Ramadi comes as ISIS continue to hold out at the strategic spot after successfully capturing the city in May.
British Kosovan Fatlum Shalaku was the first British national to carry out a suicide bomb attack during the taking of the city.
A propaganda video of his final moments were released online two weeks ago, with the jihadi describing his decision through the use of a Qur'anic quote.
Just before he climbed into his armoured vehicle, laden with explosives, Fatlum said his last words: 'I just want to go out there with a bang.'
