Mairead O’Neill was “struggling terribly” after losing her mum to cancer earlier this year and was seen downing shots with friends in Belfast on Monday night.
But at 9.39pm, just hours before her body was found, she wrote online: “If there’s one thing I’ll tell you. Never trust a best friend.”
The status has since been “liked” almost 1,000 times with many friends and followers posting love hearts and sad-face emojis.
The model, who was also known as Mairead Leigha, had graduated from university in August and had the "world at her feet", according to heartbroken pals.
But she died in Belfast on Monday after uploading videos on Instagram showing her enjoying a night out with pals.
She could be seen downing shots in a bar and dancing with her friends in clips she posted for her 8,700 followers to see.
The model wrote "might go off the rails this weekend" and asked her followers to vote "yes" or "no" if they thought boys were "d**ks".
Mairead had been mourning the loss of her mum Karean Pelan who died 10 months ago after a battle with bowel cancer.
She had posted a series of heartbreaking posts following the loss of her mum, writing: "First Mother's Day without you. Jesus I do miss you."
A GoFundMe page has been set up by family friend Julie Rooney and it has raised more than £9,500 in just one day.
Model agency boss Cathy Martin has today paid tribute to talented Mairead and said she was modelling for her since she was a teenager.
She told Belfast Live: “Mairead was a clever, grounded and very smart young lady who was beautiful.
“She had been modelling for me for about six years and was doing very well. She had a lot of strengths and had a Kardashian look that people loved.
“But what was most charming about her is that she really had no idea that she had the world at her feet.”
Cathy added: “It’s such a shock to hear that Mairead has passed away.
“We don’t know exactly what happened but she has been having a very difficult time following the death of her mum from bowel cancer.
“She had a lot of support but her heart was broken. It’s so sad to think that she is gone now too.”
She recently worked at Belfast Fashion Week and the Carl Frampton fight in August.
A number of people have taken to social media to send their condolences to Mairead’s family.
One person commented on a picture: "A beautiful person. Gone too soon. RIP."
Another added: "RIP beautiful. No words can describe how much upset this brings. You’ve left this world far too young. Much love to you."
Other friends described her as a "angel" while others said she was the "brightest star in the sky".
A Police Service of Northern Ireland spokesman said: “Police attended the scene of a sudden death of a woman in the south Belfast area on Monday October 15.
"The death is not being treated as suspicious."
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