The Wham singer was found dead on Christmas Day by Fadi, but the tweets from his account claim "the only thing George wanted is to die".
It is not known whether Fadi's Twitter account was hacked, but the posts and account have since been deleted.
A photograph of British singer George Michael is seen among floral tributes and candles outside Michael's north London home after news of the singer's death broke.
December 26, 2016 - AFP/Daniel Leal-Olivas
Pop superstar George Michael has died peacefully at home, his publicist said.
The 53-year-old, who was set to release a documentary in 2017, rose to fame as a member of Wham!, known for their hits Club Tropicana and Last Christmas.
Michael - whose real name is...