Further details about the tragic shark attack which claimed the life of a 25-year-old tourist in Australia on Thursday (27 November) have emerged.

Livia Mühlheim passed away after being mauled by a bull shark while enjoying an early morning swim with her boyfriend, Lukas Schindler, who remains in hospital in a serious condition.

The Swiss couple were visiting Kylies Beach in Crowdy Bay National Park when horror struck just before 6.30am in the morning.

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Livia had reportedly been using a GoPro to film a pod of dolphins, while swimming at the remote beach in New South Wales when the shark suddenly attacked.

She is said to have sustained several bites before the predator tore off her left arm, despite her other half’s valiant efforts to scare it away.

Lukas has been hailed as a hero after trying to stave off the bull shark as it continued to attack, resulting in him suffering two major bites to his leg.

The 26-year-old exchange student, who recently qualified as a diving instructor, then bravely carried his partner 50 metres to the shore.

Livia Mühlheim, 25, was tragically killed by the shark on Thursday (LinkedIn)

Livia sadly succumbed to her injuries on the sand before paramedics arrived, despite passersby rushing to the couple’s aid.

Aussie police said Lukas’ life was likely saved by a female bystander who managed to fashion a makeshift tourniquet from a swimsuit in order to stem the bleeding.

The woman’s actions were also described as ‘heroic’ by NSW Ambulance superintendent Josh Smyth, who explained it had bought the Swiss native valuable time as emergency services rushed to the unpatrolled beach.

“That potentially saved his life,” Smyth said, as per the Guardian. “The courage from some bystanders is amazing. To put yourself out there is very heroic and it did give us time to get to that male patient.”

Officials are now said to be reviewing the ‘harrowing footage’ captured on Livia’s GoPro prior to the attack in the hopes that it could paint a picture of what exactly happened, Sky News reports.

Reports suggest that the couple had arrived in the area on Wednesday evening before setting up camp nearby and heading for the fateful swim the following morning.

Livia, 25, was a former synchronised swimmer, according to her employer Bellecapital.

Lukas Schindler, who remains in a serious condition, bravely battled to save his girlfriend (Instagram)

She has worked as an investment associate at the asset and wealth management firm since May last year, reports state.

Her LinkedIn profile also explains that she graduated from Switzerland’s University of St Gallen in 2023 after gaining a master’s degree in accounting and corporate finance.

Lukas – who remains in a serious but stable condition – graduated with a Master of Arts degree at the University of Technology Sydney earlier this year.

A spokesperson for the Department of Primary Industries said that initial analysis suggested that ‘a large bull shark was likely to have been involved’ in the fatal attack on Thursday.

Locals have been urged to avoid Kylies Beach, which has been closed, while drones scour the area in a bid to track down the shark.

New South Wales chief executive of the Surf Life Saving, Steve Pearce, described the incident was a ‘terrible tragedy’, while warning people of the dangers of swimming at the beach.

“This area is so remote, there’s no lifeguarding services up there at all,” he said.

“These incidents are horrific for everyone, and unfortunately, we’ve had a few this year already. We’re thinking of all of those people dealing with this at the moment.”