The 77-year-old was at his Berkshire home with wife Debbie when he died in the early hours of Thursday.
A statement from his publicist said : "One of our most beloved entertainers, Paul Daniels, has passed away at the age of 77.
"The TV star, who was diagnosed with a brain tumour earlier this year, passed away peacefully at home with Debbie at his side in the early hours of this morning.
"Debbie and the family would like to thank everyone for their support and asks that their privacy be respected at this sad time."
Earlier this month, Ms McGee thanked fans for their "wonderful messages" of support.
When Daniels fell at home in February, he was rushed to hospital, suspected of having suffered a stroke. He was later diagnosed with an inoperable brain tumour.
McGee wrote on Twitter: "I wish I could answer all your wonderful messages individually but there are so many. They are all appreciated so much.
"Paul and I had no (idea) of how people felt. Truly amazing. Thank you."
One of the entertainer's three sons, Martin Daniels, had told the Sunday Mirror the family did not know how long his father had left.
He told the newspaper: "There's no treatment which can help him. Doctors haven't said how many weeks or months he might have - and we haven't asked.
"He knows things are not in his hands now and we are living in the knowledge every day is a bonus.
"It is unbearably difficult. He has said before 'When It's your time, it's your time' and that's how he is trying to face up to things."
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