Andreea Cristea's life support machine was turned off by her family on Thursday afternoon, Scotland Yard said on Friday.
It sets the clock for a two-year negotiation process for Britain's relationship with the EU as a non-member.
The Scotland Yard's Indian-origin deputy assistant commissioner, Neil Basu, in a statement said Khalid Masood's attack had echoes of the rhetoric of the Islamic State but no evidence at this stage suggests he was linked to the group.
Scotland Yard also conceded that they may "never understand" the 52-year-old attacker's motive.
Metropolitan Police Acting Deputy Commissioner and Head of Counter Terrorism Mark Rowley said in a statement that a total of nine persons remain in custody and one woman has been released on bail.
"We are not afraid. An act of terrorism tried to silence our democracy, but today we meet as normal," May said.
An attacker drove a car along a pavement in Westminster, stabbed a policeman and was shot dead by police in the grounds of Parliament.
May has already announced that she will make a statement to the House of Commons shortly after invoking Article 50 of the Lisbon Treaty.
India has expressed dismay at the United Nations' continued struggle to find a definition for terrorism, saying there seems to be more cooperation between terrorist groups than the countries fighting them.
The Lords voted on Wednesday 358 to 256 for an amendment requiring ministers to protect the rights of EU nationals based in the UK following Brexit. In the House of Lords, May's Conservative Party does not command a majority.
A grenade-dropping drone, 3D fly-on-the-wall radar to see through a 20-m-thick wall and a 'dogo robot' armed with remote pistol are some of the latest weaponry provided to the National Security Guard to undertake lethal counter-terror operations with a punch of stealth.
The International Crisis Group said that security forces were allowing 'anti-India outfits... to operate madrasas and charity fronts'.
The dress was a family heirloom from the 1870s, which had belonged to the great-great grandmother of Tess Newall from the town of Morham in the East Lothian region of Scotland.
British MPs voted in favour of the European Union (Notification of Withdrawal) Bill after two days of debate by a majority of 384-498 votes in favour to 114 against.
He has been widely named as the author of the memo, published in some US media containing extensive allegations about Trump's personal life and his campaign's relationship with the Russian state.
Balasubramanian, 50, Herchel Smith Professor of Medicinal Chemistry at Cambridge University, has been recognised for his work as a co-inventor of Next Generation DNA sequencing, described as the most transformational advance in biology and medicine for decades.
The woman was walking alone in Chingford, east London, when she was accosted by her attackers.
The group has been encouraging people to sign a petition calling for the withdrawal of the notes as vegans and vegetarians continued to express outrage at the use of tallow, a substance derived from animal fat.
The report claims it will take another six months before the government decides precisely what it wants to achieve from Brexit
The 45-year-old Australian national has been living in the embassy for more than four years after he was granted political asylum by Ecuador amid fears he will be extradited to the United States and questioned over the release of 500,000 secret military files on the wars in Afghanistan and Iraq by his controversial website.