Australian nurse Kirsty Boden "ran towards danger" to help people on London Bridge before she was attacked and killed on Sunday.
The South Australian, 28, has been hailed as a hero and an "outgoing, kind and generous" person by her family after she was named as one of the seven victims of the London terror attacks on Tuesday evening.
In a statement released on behalf of Boden's family by the UK Metropolitan Police, Kirsty is said to have lost her life "in an effort to help people on the bridge" during the attack.
"Kirsty was loved and adored by her family, friends and boyfriend. She was the most outgoing, kind and generous person who loved to help people. Helping people was what she loved to do in her job as a nurse and in her daily life," the statement said.
"As she ran towards danger, in an effort to help people on the bridge, Kirsty sadly lost her life. We are so proud of Kirsty's brave actions which demonstrate how selfless, caring and heroic she was, not only on that night, but throughout all of her life. Kirsty -- we love you and we will miss you dearly."
Boden, who is originally from Loxton, South Australia, north-east of Adelaide, was working in London as a nurse at Guy's and St Thomas' Hospital.
Chief Nurse, Dame Eileen Sills, described the 28-year-old as an "outstanding and hugely valued" person to work with, Fairfax reports.
"Kirsty was...described by her colleagues as 'one in a million' who always went the extra mile for the patients in her care," she said.
"Our thoughts at this time are with her family, her loved ones and our staff who have lost a dear friend and colleague."
Boden is the fourth Australian person caught up in the attack.
On both Monday and Tuesday, Prime Minister Malcolm Turnbull said that he had "very real concerns" for the safety of the two Australians believed to have been caught in the attack.
On Tuesday night, South Australian Premier Jay Weatherill offered his condolences to the family of Boden, describing her death as a "tragedy that will touch all South Australians".
"Kirsty's death brings the horror of terrorism closer to home for all of us," he said in a statement posted to social media.
"It's the random nature of this heinous crime which makes it so hard to fathom. As a state we mourn for Kirsty, we send our love to her family and we stand in solidarity with the people of Loxton as they grapple with this awful news."
Queensland woman Sara Zelenak, 21, is believed to be the other Australian involved. She disappeared at London Bridge on Sunday and is still missing.
"We are working diligently in London with the police and other authorities there and of course staying in very close contact with their families as we seek to confirm the circumstances relating to those two Australians," Turnbull said on Tuesday.
Darwin man Andrew Morrison and Brisbane woman Candice Hedge were both injured in the attack, it was reported Monday.
South Australian Premier Jay Weatherill said the family was being provided with support.
"We're putting in place all the appropriate measures to provide support for the families that were associated with this particular notification," he said.
The Department of Foreign Affairs And Trade (DFAT) have not confirmed the report.
The UK Metropolitan Police also confirmed the identity of the third attacker on Tuesday as 22-year-old Italian national of Moroccan dissent, Youssef Zaghba.
Despite not being listed as a person of interest in the United Kingdom, authorities in Italy have said he caught the attention of local Italian security officials after extremist propaganda was found on his mobile phone in 2016.
Zaghba joins Shazad Butt and Rachid Redouane, who UK police named as the other two attackers on Monday.
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