Many were affected by the untimely death of soul singer Amy Winehouse at the age of 27 last year. While the warning signs were always there, her family, friends and fans hoped she had changed her ways for the better. Winehouse’s father believes his daughter’s ex-husband was a contributing factor to her demise, as revealed in a new memoir set to be released later this month.

According to Spin, Mitch Winehouse says in ‘Amy, My Daughter’ that he finds it difficult to listen to the U.K. artist’s 2006 breakthrough, ‘Back to Black,’ because it is inspired by her former beau Blake Fielder-Civil. He was sent to prison in 2008 after pleading guilty to assaulting a bar owner a year prior. The couple were only married from 2007 to 2009. ”It wasn’t as if he brought much good into her life, or so it seemed to me,” Mitch Winehouse writes in the book.

The title reportedly includes details on Amy Winehouse’s struggle with addiction, especially with alcohol, which eventually took her life. “Once she became an addict, her stubbornness just got worse,” Mitch writes. “There were times when she wanted to be clean, but the times when she didn’t outnumbered them.”

‘Amy, My Daughter’ will be released on June 26, and it covers various aspects of Winehouse’s life. Mitch writes how his daughter had to cope with stage fright, as well as deal with plastic surgery. In the end, alcohol was the real enemy, and her father conceded, ”Her illness might end up killing us both.”