Winans, who performed at the 'I Will Always Love You' hitmaker's funeral in February, will release his book 'The Whitney I Knew' on July 31, with the tome including never-before seen photographs of the pop superstar, reported Contactmusic.
Houston, who had a history of substance abuse problems, was found dead in the bath of her Beverly Hills hotel room in February and Winans has promised to use the book to reveal "heart-breaking accounts that led to her ultimate defeat".
It was recently confirmed that Houston's mother Cissy will release a book about her daughter next February.
She has signed a multi-million dollar deal to write with "candor, honesty and respect" about her daughter.
"When I lost my daughter Nippy (the nickname Whitney's family gave her), the world lost one of the most beautiful voices and an extraordinarily beautiful and charitable woman.
"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," said Cissy.