With the wisdom of hindsight, Deepak Chopra recalls a conversation he had with Michael Jackson a few years ago. "He said there's something you can take that takes you to the valley of death and then takes you back," the best-selling author and physician tells TIME. "I hadn't the vaguest idea of what he was talking about. And then he quickly changed the subject." Now, says Chopra, "I see he was talking about propofol."

The role of propofol in Jackson's final days looms large even as the coroner's report remains under official seal. On Aug. 24, the Los Angeles Times reported that the L.A. County Coroner's Office found fatal amounts of the powerful anesthetic (also known as Diprivan) in Jackson's body.

Melanie Griffith knows all too well the challenges of getting – and staying – sober.

The actress, who underwent treatment twice for substance abuse in 1988 and 2000, checked into a rehab facility, her rep said Monday, to "reinforce her commitment to stay healthy."

Her third stint in rehab marks what has been an on-again, off-again battle with addiction for the past three decades.

Admitting she has "an addictive personality," Griffith, 52, once told Australian magazine New Idea four years after her first trip to rehab that she's "lucky to be alive. I was never as bad as some people I knew, shooting heroin and stuff. But I did do a lot of drinking and cocaine. I just thought I was having a good time."

Her problems first got out of control when the then 18-year-old Griffith was "living in a real wild 'sex, drugs and rock 'n' roll'