The 28-year-old was shot dead by police after two people were killed and three others were wounded in Friday's stabbing.
He was armed with two knives and wearing a fake suicide vest when he was tackled by members of the public before he was shot dead by police on London Bridge.
Mr Merritt's death was confirmed by his father David on Twitter.
Mr Merritt, from Cambridge, was a course coordinator for Learning Together, a prisoners' rehabilitation programme which was hosting the conference at Fishmongers' Hall, at the north end of London Bridge.
Cambridge Vice Chancellor Stephen Toope said he was "devastated" to learn that the attack may have targeted people attending an event organized by the university's Institute of Criminology.
Khan, whose family is from Pakistan-controlled Kashmir, was convicted in 2012 for his part in an al-Qaeda-inspired plot to blow up the London Stock Exchange. Further questions were raised when the Parole Board said it had no involvement when Khan left prison last December, saying he "appears to have been released automatically on licence".
"These offenders would remain, even after a lengthy term of imprisonment, of such a significant risk that the public could not be adequately protected by their being managed on licence in the community, subject to conditions, by reference to a preordained release date", the judge reviewing Khan's case wrote in the ruling.
One of the conditions was that Khan was obliged to take part in the government's desistance and disengagement programme - the goal of which is the rehabilitation of people who have been involved in terrorism.
Forensic officers work at the scene of the stabbings on Saturday.
She thanked police and emergency services "as well as the fearless individuals who put their own lives at risk to selflessly help and protect others".
Mr Basu added officers had found no evidence to suggest anyone else was involved in the attack.
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The mayor was speaking as police searched homes in Stafford, 225 kilometres northwest of London, in connection with the investigation.
Staffordshire Police's Deputy Chief Constable, Nick Baker, said it was "vitally important everyone remains alert but not alarmed".
A British Transport Police officer in a suit and tie who also intervened was seen carrying a large knife away. "They regarded themselves as more serious jihadis than the others".
One video posted on social media showed two men struggling on the bridge before police pulled a man in civilian clothes off a black-clad man on the ground, with gunshots ensuing.
One witness described how a man at the event at Fishmongers' Hall grabbed a narwhal tusk - a long white horn that protrudes from the whale - that was on the wall, and went outside to confront the attacker.
Some of those who helped were believed to be former prisoners attending the conference.
Among them were London's then Mayor and current Prime Minister Boris Johnson, the dean of St Paul's Cathedral, and two rabbis. "It does not make sense or us as a society to put people who have committed terrorist offenses, serious violent offenses, out on early release".
In an interview on Sky News, Prime Minister Boris Johnson said that those individuals represent "the best of our country".
The latest attack came less than two weeks before Britain's general election, and thrust the issue of terrorism into the heart of the campaign.
Flags on United Kingdom government buildings were flown at half-mast as a mark of respect to all those affected by the attack.
Almost a year later, he carried out a terror attack, although not nearly as ambitious as those he and his terrorist associates had planned in the 2010s.
"We send our thoughts, prayers and deepest sympathies to all those who have lost loved ones and who have been affected by yesterday's bad violence".