"Her passing was from Alzheimer's/Dementia and Barbara eventually died peacefully and I spent the last 7 days by her side", the statement continued.
According to the statement, she passed away on Thursday at a London Care Home.
The soap and film star was diagnosed with Alzheimer's disease in 2014 and went public with the news four years later.
When the sad news broke last night, thousands of people paid their respects on social media - with many sharing their favourite anecdotes and news stories about Barbara, best known as EastEnders matriarch/pub landlady Peggy Mitchell.
She was nominated for a Bafta for her role in the 1960 kitchen-sink drama Sparrows Can't Sing; appeared in Chitty Chitty Bang Bang and the Broadway run of the groundbreaking musical Oh, What a Lovely War! on Broadway in 1965.
"Too many to comprehend".
In 2009, Dame Barbara announced she would be leaving the soap again in order to spend more time with her husband Scott, who she married in 2000.
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In this January 19, 1971, file photo, British actors Sid James and Barbara Windsor in a scene from the British comedy "Carry On Henry" being filmed at Pinewood Studios, in Iver, England.
Nitin Ganatra, who played played Masood Ahmed on EastEnders, first in 2007 and leaving for a second time previous year, said it was "devastating news".
"I can hear that laugh now as I sit and think about her".
Doctor Who star John Barrowman, who was interviewed by Dame Barbara on BBC Radio 2 in October 2011, said in a video on Twitter that the star will be "sorely missed". We shared such magical times together and I'll cherish every one.
"It's always been my biggest fear, that one day I would have to take her somewhere and she'd be thinking, 'Why would he do this to me?'". I hope it'll ring in my ears forever.
He added that she knew how to carry herself on set, saying: "You know what it means to be the top of the bill, to have the responsibility of carrying the show and and looking after everybody that's all around you, helping you to move it along and keep it up to scratch, and she had to do it".
Her former EastEnders co-stars were among those paying tribute to her. I'm gutted! I could say so much but I'm so sad. "You were the unofficial Queen of England, an icon for over half a century and treasured by the nation".
"Coronation Street" actress Jane Danson (Leanne Battersby) was "absolutely made up" when she met Barbara in 1998.