Brown, who joined the cast as Dot Cotton just a few months after the show premiered in 1985, is taking an extended holiday and plans to write her autobiography during her time off, according to The Mirror.
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"Some friends on the set feared she may be considering a permanent exit but EastEnders bosses are determined to keep her and they have offered her six months off which she has taken," a production insider said.
"She has admitted the filming can be exhausting and she feels some time off is long overdue."
Brown's agent said yesterday: "June has taken some time away from EastEnders to focus on her autobiography, but she will be returning to the programme."
An EastEnders spokesperson also confirmed that Brown is on a break "but will be back in a few months".
It has been reported that the 85-year-old actress originally suggested a year's sabbatical to producers.
Brown filmed her exit scenes last week and will be seen leaving the show around the middle of May.