Peaches, 25, was found dead at her home in April. It was later confirmed that class A drugs were found in her system.
Dad-of-four Bob has revealed he feels responsible for his daughter's death, and feels that he failed her.
He told ITV News: "You blame yourself. You're the father who is responsible and clearly failed.
"Yes, of course you do. For anybody watching, who has a dead kid and you're a parent. You go back, you go back, you go back, you go back, you go back, you go over, you go over.
"What could you have done? You do as much as you can."
Bob admitted to knowing about the problems his daughter was facing, and that they did discuss it.
He said: "Course I knew about it and we did more than talk about it, yeah. She was super bright. Too bright.
"A very errant mind that could focus intensely on a book which she would consume and just absorb it. But the rest was franticness. She knew what life was supposed to be and God bless her she tried to get there. And she didn't make it."