A 75-year-old man has become the fifth person to die following the London terror attacks.
He was one of three to die after being mowed down on the footpath on Westminster Bridge on Wednesday by Khalid Masood, who went on to also stab to death police officer Keith Palmer outside Parliament before being shot dead.
An American man celebrating his 25th wedding, Kurt Cochran, and British other-of-two Aysha Frade were the other two killed after being run down on the bridge.
A decision was made to turn off the life support of the yet to be named 75-year-old late on Thursday night in London (local time).
Of the more than 20 victims still being treated in hospital, at least one other is reported to have life-threatening injuries.
Husband killed celebrating anniversary
Mr Cochran of Utah was celebrating his anniversary with wife Melissa when Masood used his Hyundai SUV to plough through pedestrians shortly after 2.40pm (local time).
The 52-year-old engineer was killed at the scene while his wife was left with a broken leg, ribs and head injuries.
Mrs Cochran's family said they were "heartbroken" by the news of Kurt's death.
"Kurt was a good man and a loving husband to our sister and daughter, Melissa," they said.
"We express our gratitude to the emergency and medical personnel who have cared for them and ask for your prayers on behalf of Melissa and our family. Kurt will be greatly missed," they added.
US President Donald Trump paid tribute to Mr Cochran on Twitter.
A great American, Kurt Cochran, was killed in the London terror attack. My prayers and condolences are with his family and friends.— Donald J. Trump (@realDonaldTrump) March 23, 2017
Mother of two mowed down
Aysha Frade was walking across the Westminster Bridge on Wednesday to pick up her two daughters, aged eight and 11, when she was fatally struck down by the SUV.
The 43-year-old British-born school administration officer was hit by the terrorist’s Hyundai and then thrown under a bus.
“All our thoughts and our deepest sympathies are with her family,” school spokesperson Rachel Borland said.
“Aysha worked as a member of our administration team at the college. She was highly regarded and loved by our students and by her colleagues. She will be deeply missed by all of us.”
"Hero" police officer stabbed outside parliament
Unarmed police officer Keith Palmer, who was fatally stabbed as he stood guard at an entrance to parliament, has been hailed as a hero.
The 48-year-old husband and father was a police officer for 15 years, who was part of the parliamentary protection force.
Prime Minister Theresa May called him "every inch a hero".
He previously served in the British army alongside James Cleverly, now a Conservative MP, who tweeted: "A lovely man, a friend. I'm heartbroken."
Cleverly paid an emotional tribute to his friend in the House of Commons and asked that he receive a posthumous award for his actions.
Twenty-nine remain in hospital
Police said 29 of around 40 people wounded were treated in hospital. Seven remained in a "critical condition" on Thursday.
South Australian cafe owner Patrica Neis-Beer is lucky to be alive after she was innocently taking in the beautiful sights from Westminster Bridge.
She has undergone foot surgery after she flew to London to visit her daughter.
Another woman that "flipped over the bridge" is recovering with serious injuries after she was pulled from the icy cold waters of the River Thames.
Horrifying footage emerged of the moment she plummeted into the water as the car sped down the Westminster bridge footpath.
Three French pupils, aged between 15 and 16, on a school trip to London were among those hurt, including two who suffered broken bones but were not reported to be in life-threatening condition.
Prime Minister Theresa May said that among the people admitted to hospital were 12 Britons, four South Koreans as well as one German, one Pole, one Irish, one Chinese, one Italian, one American, two Greeks and two Romanians.
The injured also included three police officers who were returning from an event recognising their bravery.
"Two of those three remain in a serious condition," May added.