Marnie Lee Cave Tathra murder

Marnie Lee Cave's body was identified through a distinctive butterfly necklace. Photo: Facebook.

Marnie Lee Cave's body was identified through a distinctive butterfly necklace. Photo: Facebook.

In the days after the body of Bega woman Marnie Lee Cave was found under a bridge on the NSW Far South Coast, Rosemary Mackie's Facebook page was filled with messages of sorrow and condolence for the young victim she described as her "friend".

"RIP MARNIE U CAN FLY FREE AS A BUTTERFLY," Ms Mackie, 52, wrote on her Facebook page.

"This is crazy and Marnie I hope they find the person who done this and so he can rot in hell."

The person who killed such a "beautiful woman", Ms Mackie wrote, should be "put away for life".

On Wednesday morning, Ms Mackie was sitting in the dock at Batemans Bay Local Court charged with murdering the very woman for whom she had been posting condolence messages.

Ms Cave's body was found under the Mogareeka Bridge in the coastal town of Tathra on October 14.

The 26-year-old, who grew up in Canberra before moving to Bega four years ago, was studying childcare at TAFE and also volunteered with helping the homeless and disadvantaged.

She was last seen walking past Momsen Motors in Bega on October 13.

At 8.15am the following day, two campers discovered her body lying under the bridge, about 20 kilometres from Bega.

Her handbag and phone were missing but she was wearing a distinctive butterfly pendant necklace. In the days after her death, police released a photograph of that necklace in a bid to identify her.

Detectives attached to Strike Force Bract, formed to investigate Ms Cave's death, arrested Ms Mackie on Tuesday morning at a property in Bega. She was charged with murder and wounding with intent to cause grievous bodily harm.

Ms Mackie remained silent and entered no plea as the charges against her were read out in court.

In the days following Ms Cave's death, police questioned Ms Mackie's 52-year-old partner and took a statement from him.

However, he was found dead in a house on Valley Street in Bega on October 22.  Police said the man's death was not suspicious.

Ms Mackie's lawyer Geoff Knox did not apply for bail for his client, and it was formally refused by registrar Virginia Scanlon on Wednesday.

The case was adjourned to December 15 when Ms Mackie will appear in Bega Local Court by audio visual link.

Outside the court, Mr Knox said it was unclear where Ms Mackie would be remanded in custody. 

"She will be taken to wherever there is room," he said. 

"The overcrowding of jails is out of control. 

"I have had clients remain in the police cells for days." 

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Tathra body under bridge: Woman faces court

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