Cissy Houston Talks Pain of Whitney's Passing

As the one-year anniversary of Whitney Houston's untimely passing looms, Oprah sits down with the music icon's mother, Cissy Houston, for her first in-depth, sit-down interview since that tragic day.

"I was a wreck. I was just a wreck," says Cissy of first receiving the news that her daughter was dead on next Monday's Oprah's Next Chapter.

Pics: Remembering Whitney: A Life in Photos

In the interview held at Cissy's New Jersey home, she talks about raising a daughter whose voice became a national treasure, teaching Whitney about the music business -- and her biggest regrets. Oprah also talks to Cissy about when and what she knew about Whitney’s drug use, how she really felt about her daughter’s marriage to R&B singer Bobby Brown and the true nature of Whitney’s relationship with her high school best friend, Robyn Crawford.

Oprah also talks to Whitney's older brother, Michael Houston, for the first time since his sibling's death, and he emotionally reveals the origin of Whitney’s drug use.

Related: Whitney Houston Full Autopsy Report Released

Oprah's Next Chapter airs on Monday, January 28 at 10pm EST/PST on OWN: Oprah Winfrey Network.