An ex-student of a prestigious $26,000-a-year private school has mysteriously vanished, just days after she put her possessions up for sale on Gumtree.
Kathleen Riethmuller, 28, was last seen on security camera footage while visiting Bunnings Artarmon in Sydney’s north on October 28.
Hours later, Ms Riethmuller’s belongings including her ID, phone and bank cards were found abandoned in a backpack at Lane Cove.
Her family hasn’t heard from her since, sparking a nationwide police hunt for her amid increasing fears for her safety.
Now worried friends have begged Sydneysiders for their help to track down Ms Riethmuller, with her family stranded in Queensland by Covid restrictions.
Kathleen Riethmuller, 28, (pictured) has been missing for almost three weeks after mysteriously vanishing from Sydney’s north
Police inquiries revealed Kathleen attended a retail store on Reserve Road, Artarmon, about 11.40am on Thursday 28 October (pictured, left), before she was spotted again at 2.30pm the same day in North Sydney, wearing a long sleeve denim dress and black flat shoes (right)
Daily Mail Australia can reveal Ms Riethmuller had posted 11 items for sale on Gumtree between October 16 and 22, with a collective value of $1,260.
The goods include a framed picture, art easel, Lululemon yoga mat, starry night lamp, and gym step – all priced at $60 or below.
More expensive wares for sale included include a $350 hand mirror, $200 pull up/tricep dip frame, $150 wall tapestry, $120 acupressure mat, and a vintage 70s style room divider and macramé pot hanger – both listed for $100.
None of the items have been marked as sold and there has been no activity on the Gumtree account since she vanished.
In the week leading up to her disappearance, the 28-year-old listed several items for sale on Gumtree (pictured, left and right)
Other items listed for sale include a starry lamp (pictured, left), art easel (right), yoga mat, gym equipment, and a $350 mirror
A Facebook page dedicated to finding Ms Riethmuller has now been launched to help in the hunt.
Friends fear she may need medical assistance, and have shared a map of her last known locations, urging anyone with information to come forward.
‘We ask that those with dash cameras who were in the vicinity of any of the below areas during or around the hours of 11am – nightfall have a look to see if they can spot Kathleen or anything else that could help locate her,’ begs the page.
‘We are hopeful that reaching out as far and wide as possible can assist in getting her home safely.’
A map posted in a Facebook page dedicated to finding Ms Riethmuller shows her known movements around Sydney around the time she disappeared
Detectives are exploring a suggestion Ms Riethmuller may have travelled to Melbourne for job opportunities and have now extended the search into Victoria.
But the lack of contact with her family and the discovery of her bank cards have raised serious concerns for her safety.
Ms Riethmuller graduated from Brisbane Girls Grammar – which costs about $26,555-a-year – in 2010 before studying a Bachelor of Business Management/ Science at The University of Queensland, according to her social media profiles.
Facebook posts suggest the 28-year-old fitness enthusiast has been living in Sydney since at least May this year.
Ms Riethmuller’s (pictured) phone, ID, bank cards, and other belongings were found abandoned in a suburban street on the day she was last seen
Pictured: Elephant Backpacker at 50 Sir John Young Crescent, Woolloomooloo Sydney where she was known to visit in the weeks before her disappearence
She was known to have frequented a unit on King Street in Sydney and a backpacker hostel on Sir John Young Crescent, Woolloomooloo, in the weeks leading up to her disappearance.
Police inquiries have revealed Ms Riethmuller attended a Bunnings store on Reserve Road, Artarmon, about 11.40am on Thursday 28 October.
She was spotted again at 2.30pm the same day in North Sydney, wearing a long sleeve denim dress and black flat shoes.
Ms Riethmuller is described as Caucasian, about 165cm – 175cm tall, with a thin build and long dark hair.
Anyone who may have information about her whereabouts or has seen her is urged to contact Chatswood Police Station or Crime Stoppers on 1800 333 000.
A member of the public found her belongings, including her ID and bank cards, in a backpack on Centennial Avenue (pictured) at Lane Cove