Amy Winehouse was found dead at her Camden home in July. Toxicology results have shown that she did not have illegal drugs in her body when she died. Speaking to The Sun, Mitch said that Amy's death was a "horrible accident".
"I blame him for a lot of things. He started her on the road to hard drugs," he said. "But her death was a horrible accident. It was her responsibility. She was told that if she detoxed without medical intervention, this whole thing could happen. He started her off on the road to drugs. But I don't blame him for her death."
He continued: "She had seizures because she would binge drink and then stop. She had one in a hotel room in New York once when she was on Skype to a friend. She conked out in front of him. I had to ring hotel security and they rushed in there.
"She had that history. We won't know until the outcome of the inquest, but that's what we suspect was the cause."
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Mitch urged Fielder-Civil, who is currently serving 32 months in prison on burglary and a firearms charge, to donate any profits from a rumoured book to the foundation he is setting up in Amy's name.
"We have been criticised for not letting Blake and his parents be a part of it," the 60-year-old said. "But I'm not aware they have been in touch. He can't be part of the foundation, because we'd be a laughing stock. But if he wants to make a donation, we'll take it.
"Someone told me Blake was going to write a book. What's he going to do with the money? I hope he's going to put it into the foundation."
Branding Fielder-Civil a "violent criminal", Mitch claimed that his former son-in-law had "ruined" attempts to help Amy recover from her drug addiction.
"Amy had left Blake and was going to spend four days with friends. He turned up, brought drugs and ruined everything. Then his family came and there was a big fight," he told the paper. "We did agree on one thing, and that was to send them to rehab.
"They went to Osea Island in Essex, by helicopter. The only way you can get on the island is when the tide is out. I thought, 'There is no way they can get drugs on there'. But Blake got a fisherman to bring them in for them."
He continued: "When he came off the island, Blake said, 'I like being a drug addict. I like being on drugs. I have no intention of coming off drugs'. At that point I thought, 'We're in trouble here'. Amy was saying she couldn't be doing it anymore - but her husband actually wanted to continue."
Mitch added: "The start of her recovery was when he went to prison."
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Watch Amy talk about recording her recent duet with Tony Bennett: