Five months after the death of her brother Michael Jackson, pop legend in her own right Janet Jackson is speaking out for the first time about the day Michael died to why she thinks Dr. Conrad Murray is responsible for the King of Pop’s death in a new interview with ABC News’ Robin Roberts.

“He was the one that was administering,” Janet told the correspondent during In The Spotlight With Robin Roberts: Janet Jackson, airing Nov. 18. “I think he is responsible.”

Janet said it’s still hard to imagine that her brother is no longer here: “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,’” she told Robin. “I called everyone. There’s a line busy or — someone wasn’t picking up. I spoke to mother. I spoke to Tito. I spoke to my nephew Austin. I spoke to my sister La Toya.”

Janet said news of her brother’s death was almost impossible to believe.

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

The 43-year-old singer said she looks back on the last time she saw her brother with fond memories.

“We had a lot of fun, laughing. …I was being silly, acting silly. And he was sitting in front of me and just cracking up, laughing at me,” she recalled. “I was being loud. And he thought it was so funny. I was just being stupid, acting silly.”