"He was the one who was administering," she told Roberts. "I think he is responsible."
Murray is still under investigation by police and has admitted giving Jackson the powerful drug propofol, which the coroner pinned as the cause of his death.
Janet also revealed what happened the day Michael died, giving a rare glimpse into very personal details of the normally reticent star's life.
"I couldn't believe it," she said. "I was at my house in New York. You know, another day. Another morning. And I get a call... [my assistant] said, 'Your brother's been taken to the hospital. It's on CNN right now.' I called everyone... I spoke to Mother. I spoke to Tito. I spoke to my nephew, Austin. I spoke to my sister, La Toya. I told them to call me when they got to the hospital. And I remember thinking, nobody's calling me back, so I tried calling again, and that's how I found out that he was no longer."
"It didn't ring true to me," she remembered. "It felt like a dream. It's still so difficult for me to believe."
Janet is also rumored to have broken up with longtime love Jermaine Dupri before her brother's death. "It's been a tough year," she said. "You have your days where it's just, really, it's hard to believe. And a day doesn't go by that I don't think about [Michael]."
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