Janet Jackson: Dr. Conrad Murray Killed Michael

In an interview with ABC's Robin Roberts, Janet Jackson is not holding back when it comes to Dr. Conrad Murray, the man she believes killed her brother Michael.

Of Michael Jackson's former personal physician, the target of an LAPD homicide investigation, Janet says: "He was administering ... I think he is responsible."

Dr. Conrad Murray has admitted to administering Propofol, a powerful anesthetic, to Michael Jackson to help him sleep, but claims he didn't kill the King of Pop.

In the interview, airing Wednesday, Janet says Murray, who may face manslaughter or even murder charges, should no longer be allowed to practice medicine.

Of Michael's death, she adds "It's been a tough year ... You have your days where it's just hard to believe. And a day doesn't go by that I don't think about him."

Janet Jackson is opening up about her brother's tragic death.

She recalled the fateful day of June 25, when she learned her brother passed away. "I was at my house in New York. You know, another day. Another morning."

"Then 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 my brother Tito. I spoke to my nephew Austin. I spoke to my sister La Toya."

A tearful Janet Jackson added, "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 ... I couldn't believe it."

"It just didn't ring true to me. It felt like a dream. It's still so difficult for me to believe. It's, you know, you have to accept what is. But it's so hard. You have to move on with your life. You have to accept what is and I understand that."

More excerpts and quotes from MJ's sister to come as they become available this week. Follow the jump for an ABC promo of Janet Jackson's interview ...