*Ending months of speculation, Cissy Houston has officially announced she is penning a book about her late superstar daughter, Whitney Houston.

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The Houston family matriarch signed a deal with HarperCollins, which promises the “unabridged and unbelievable story” of the talented and troubled singer, whose once-soaring career stumbled while she grappled with drug addiction and a rocky marriage to Bobby Brown.

“When I lost my daughter Nippy (Whitney Houston’s nickname), the world lost one of the most beautiful voices and an extraordinarily beautiful and charitable woman,” Cissy Houston said Monday in a statement via The Associated Press.

“In sharing our story in this book, I hope to give her fans something to treasure, the way we all treasured Whitney. We are still receiving thousands of letters each day from her fans, and I hope reading this book will provide a deeper understanding into my daughter’s true story,” continued Houston.

The book will be published in February 2013; financial terms weren’t disclosed.

In April, reports emerged that she had been pitching the book idea to publishers, promising a true tale of Houston’s life.