Robin Roberts sat down with troubled performer Bobby Brown, who lost both daughter Bobbi Kristina and ex wife Whitney Houston in a span of three years, to talk about life and tragedy as he promotes his book Every Little Step.

In the interview, the music man opened up about the loss of his daughter, who died in July 2015, after being found unresponsive in a bathtub in her Georgia home six months prior.

In the sit down, the former New Edition singer made it clear that Bobbi Kristina's boyfriend Nick Gordon is the one he blames for her death.

Brown told Roberts, "It's not a mystery to me. I know exactly what happened to my daughter. The same thing that happened to my daughter happened to Whitney. There's only one person that was around both occasions." Roberts then acknowledges the one that Brown is referring to is Gordon.

Brown also revealed that his daughter had told him two days prior to the bathtub incident that she was going to move to Los Angeles to be closer to him.

Fighting back tears, Brown said, "The two days before what happened to my daughter, she was to come out here to Los Angeles to me. If I could get those two days back... my daughter would be here. All I want is those two days back."

What a sad scene ...

While Brown certainly is a grieving father, he also acknowledges his own seriously bad behavior that likely helped contribute to his daughter's troubled life.

In the book and in the interview, Brown admits he hit Houston once during their 15-year marriage and that his daughter was around for a lot of the couple's drug use.

Brown said that he and the late singer would lock themselves into a wing of their house for days, drink alcohol and get high on cocaine and crack-laced joints, while their daughter was being raised by nannies a few rooms down.

It seems unlikely that Bobbi Kristina was not affected by her parents non-stop drug use. "I always made it a point to not let her see me or my wife in that type of situation. It's hard when you're doing it everyday, it's really hard," said Brown.

He also explained that, "The last few years of our marriage it was terrible. Both of us trying to be clean, or one of us trying to be clean... it was terrible."

The whole thing sounds pretty terrible ...