Greta's sister Lise Van Susteran exclusively tells Radaronline.com that the news comes as a complete shock to the family.
"I had no idea she was leaving, she hasn't told me," Lise exclaimed.
Lise went on to say that her sister had never discussed any issues at the network and does not know why she would leave.
Meanwhile, Greta's husband and manager, John Coale, told CNNMoney: "They let her go. We're working out contract issues now."
Greta seemed to address MSNBC's termination more directly in one tweet, writing: "I did the best job I could. They had a right to terminate me if they did not like the program."
The media personality then went on to express her concerns over the fate of staff and crew members, many of whom have been with her since her time at Fox News.
"That is my heartbreak-I love the staff and the crew. I feel I turned their lives upside down (will they lose their jobs?)," she said.
Greta got her rise on the Fox News network, anchoring her show, On The Record With Greta, for 14 years. Prior to Fox News, she was a legal analyst for CNN, covering the infamous O.J. Simpson case.
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