Lee died on June 7 at Chelsea and Westminster hospital in London, after being hospitalised for respiratory problems and heart failure.
The decision to release the news days after was based on his wife's desire to inform family members first. The couple had been married for over 50 years.
The English-born actor, who made his name playing Dracula and Frankenstein in the Hammer horror films, appeared in more than 250 movies.
His first role with the studio was "The Curse of Frankenstein" and it was the first of 20 films that he made with Peter Cushing, who also became a close friend.
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Lee's most famous role for Hammer was playing Dracula, a role which became one of his most widely recognised although the actor was not pleased with how the character was treated.
He was knighted in 2009 for services to drama and charity and was awarded the Bafta fellowship in 2011.
After dabbling with music throughout much of his career, including a song on "The Wicker Man" soundtrack, Lee released his first full-length album Charlemagne: By the Sword and the Cross in 2010.
It was well-received by the heavy metal community and won him the spirit of metal award at the 2010 Metal Hammer Golden Gods ceremony.
The actor still has one film yet to be released, a fantasy film "Angels in Notting Hill", where he plays a godly figure who looks after the universe.
"We are deeply saddened to hear that Sir Christopher Lee has passed away," the British Film Institute (BFI) tweeted, as the news broke today.