In her message, Rebekah said: "Hi everyone, I want to kindly ask that people stop spreading the news that I'm dead because obviously I'm not".
'This person can not accept the fact that I am happy, that I've finally overcome my problems. I am in Arabia and I am not dead.
It is unclear who sent the tweet.
But hours later she recorded an emotional message claiming she had been a victim of a cruel hoax and that she was very much alive and well. And she achieved so much through her transition", while a third wrote, "Oh no.
It wasn't until five years later, in 2014, when the personality formerly known as Rodrigo underwent gender reassignment surgery to officially become Rebekah.
Shelton appeared on the show during its Channel 4 run in 2009, where she eventually finished in fifth place.
But past year, the reality star admitted she was struggling to cope with the huge transition because she felt isolated.
Shelton appeared on the Channel 4 show in 2009 while she was in the United Kingdom as a student living in Leeds.
Trump threatens to freeze aid to Palestinians
While Israel sees Jerusalem as its undivided capital, Palestinians also claim east Jerusalem as the capital of their future state. The US gives Israel annual military aid of $3.1bn. "We still very much want to have a peace process".
She had told OK!
"He saw me as a woman, the person I am".
"I used to look at myself in the mirror and I was a good looking guy". "I think my appearance on the show [Big Brother] helped me to get to know myself better".
She appeared on the show as a man, but after she left she went through transition and said that it was sparked when she met a man she was in love with. I started crying in the corridor saying, "I regret it, I regret it".
"It's a hard decision because first you have to face yourself, because it's not easy to be a different person or what's considered different". I've been through the worst three years of my life.
"Unfortunately I only knew her as Rodrigo Lopes from @bbuk".
"The only think I wish is that my family will learn to accept me", she said.
Rebekah also previously admitted that she had turned to prostitution after being forced to leave her home in Brazil and candidly spoke about having suicidal thoughts after falling out with her friends and family.