of marijuana and cocaine. By the 2000s she was struggling; her voice grew smaller, scratchier and less secure, and her performances grew erratic.

All of Ms. Houston’s studio albums were million-sellers, and two have sold more than 10 million copies in the United States alone: her 1985 debut album and the 1992 soundtrack to “The Bodyguard,” which includes “I Will Always Love You.”

But her marriage to the singer Bobby Brown — which was, at one point, documented in a Bravo reality television series, “Being Bobby Brown” — grew miserable, and in the 2000s, her singles slipped from the top 10. Ms. Houston became a tabloid subject: the National Enquirer ran a photo of her bathroom showing drug paraphernalia. And each new album — “Just Whitney” in 2002 and “ILook to You” in 2009 — became a comeback.

At Central Park in 2009, singing for “Good Morning America,” her voice was frayed, and on the world tour that followed the release of the album “I Look to You” that year, she was often shaky. Whitney Houston was born on Aug. 9, 1963, in Newark. She sang in church, and as a teenager in the 1970s and early 1980s, she worked as a backup studio singer and featured vocalist with acts including Chaka Khan, the Neville Brothers and Bill Laswell’s Material.

Mr. Davis signed her after hearing her perform in a New York City nightclub, and spent two years supervising production of the album “Whitney Houston,” which was released in 1985. It placed her remarkable voice in polished, catchy songs