German tourist, 20, may have been racing her 19-year-old boyfriend when boats collided in Pittwater

A young German woman who moved to Australia and was tragically killed in a boating accident in Sydney’s Pittwater area shared posts about her ship’s renovation and joked about ‘ghosts’ just weeks before her death.

Kassandra Muhr, 20, was found unconscious in her boat after the collision on Sunday evening by paramedics and unfortunately could not be revived.

Her boyfriend and local boat builder Kobi Bennett, 19, was rushed to hospital with serious head injuries.

Ms Muhr, known to family and friends as Kaysy, posted a photo to her Instagram two weeks ago as she sandblasted her boat and wrote: ‘If you see a ghost fly (in blue Haines ) above Pittwater, that’s probably me covered in dust”.

She was fixing the little runabout and had also posted about installing lights in the boat as a safety precaution – the Pittwater area is notoriously dark at night.

‘For what it’s worth. After never having one, I thought it was time to invest in navigation lights without risking getting caught every night. There’s still some wiring to do, but at least they’re here,’ she wrote on July 10.

Ms Muhr (pictured) loved boats and water

Kassandra Muhr (pictured) posted about her boat being refurbished in the weeks before she died in a collision with a speeding boat on Sydney’s Pittwater

Police are investigating whether the German national and her boyfriend were running in small runabouts (pictured) when they were involved in the boating accident

Police are investigating whether the German national and her boyfriend were running in small runabouts (pictured) when they were involved in the boating accident

Paramedics had to be winched by helicopter in low light conditions to a remote jetty near Elvina Bay in Pittwater on Sunday around 7pm to gain access to Ms Muhr and her boyfriend.

The area is opposite the exclusive Scottish island where Ms Muhr lived in a two-storey house set back in the secluded forest.

Along with her little runabout, Ms Muhr posted about her yacht being repaired on her Instagram where she went by the name Pittwater Pirate.

“Ahoy my pirate friends. Thought as a girl with a passion for boats and the ocean as well as fixing things, it might be fun to follow the rebuild of my 28ft yacht ‘Eric’,” she wrote.

Police confirmed two small vessels were involved in the accident, with Mr Bennett apparently on the other boat.

The local said they heard a loud “bang” followed by cries for help.

Whether the two were racing is also a factor in the investigation, police said.

The man was treated at the scene for serious head injuries and then taken to Royal North Shore Hospital where he is believed to be in serious but stable condition.

The woman sadly died while the man was rushed to hospital in serious but stable condition following the collision in the Pittwater area (pictured)

The woman sadly died while the man was rushed to hospital in serious but stable condition following the collision in the Pittwater area (pictured)

Two NSW air ambulances responded to the crash, witnesses said they heard a bang and then screamed for water

Two NSW air ambulances responded to the crash, witnesses said they heard a bang and then screamed for water

Ms Muhr (pictured) loved boats and water and frequently posted her adventures on Instagram where her name was Pittwater Pirate

Ms Muhr (pictured) loved boats and water and frequently posted her adventures on Instagram where her name was Pittwater Pirate

Marine Area Command NSW Police Commander Detective Superintendent Murray Reynolds said he seized two boats in connection with the incident.

“The investigation is continuing but there is evidence that the vessels collided with each other,” he told reporters on Monday morning.

“We have not yet understood exactly what happened, but the ships were potentially going in opposite directions.

Both boats will undergo further forensic examination and detectives are also investigating whether alcohol and speed were factors in the accident.

“There were two people involved in the collision, one of them deceased, aged 20, believed to be a German national. The other, a 19-year-old who had been airlifted to Royal North Shore Hospital,” he said.

Detective Inspector Murray said the area where the crash happened was ‘extremely dark’ even at 7pm when the accident happened.

“It’s a tragedy, it’s a horrible set of circumstances,” he added.

Christine Marks of NSW Ambulance said emergency services rushed to attend the remote scene, located off Ku-Ring Gai National Park.

“It was a major mobilization of the emergency services in very difficult circumstances – pitch black, through cold water, in a very inaccessible place,” she said.

“Our aeromedical team was very successful in accessing the patient under the circumstances.

Ms Muhr was renovating her boat (pictured)

The little runabout is believed to have been involved in the crash (pictured)

Ms Muhr was refurbishing her small runabout (pictured) which was believed to have been involved in the crash

Ms Muhr (pictured), originally from Germany, had moved to Australia a few years ago and lived in the Elvina Bay area

Ms Muhr (pictured), originally from Germany, had moved to Australia a few years ago and lived in the Elvina Bay area

The small runabouts crashed near Elvina Bay on Pittwater around 7pm on Sunday - opposite the exclusive island in Scotland where Ms Muhr lived in a two-storey house (pictured)

The small runabouts crashed near Elvina Bay on Pittwater around 7pm on Sunday – opposite the exclusive island in Scotland where Ms Muhr lived in a two-storey house (pictured)

Paramedics had to be winched to a remote jetty (pictured) in low light conditions to access the man and woman

Paramedics had to be winched to a remote jetty (pictured) in low light conditions to access the man and woman

“(The man) suffered multiple cuts and bruises to his face and legs for which paramedics provided pain management.

“I’m sorry there was such a tragic outcome in this case.”

Two ambulance helicopters, four ambulances and water police responded to the accident.

The police will prepare a report for the coroner.

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