After hearing of Amy's death Mitch flew straight back home to the UK and he spent the entire flight in a state of total shock that his 27-year-old daughter was gone.
He explained: "I was just sitting there. The flight home was horrendous. In my mind, I was saying, 'Stop messing about, Amy'. She was a practical joker and I just hoped everyone had it wrong - even though I knew it was right.
"It was horrible. I couldn't cry. I wasn't able to do anything. I was just numb."
Mitch believes Amy - who had struggled with alcohol and drug abuse before her death - passed away from a seizure related to her alcohol detoxification.
While the part-time jazz singer - who separated from Amy's mother, Janis, when she was young - still can't watch videos of them together, he tries to remain positive, and is also still close to Reg Traviss, her boyfriend at the time of her death.
He said: "I can't watch any footage of her. I broke down when I saw some clips of us together on TV. But I want to remember everything about her. The good times and the bad times. I don't want to forget anything."
The cause of Amy's death has not yet been determined, although a toxicology report has ruled that drugs and alcohol did not contribute to her passing.
Mitch is launching the Amy Winehouse Foundation this week, a charity which will help young people suffering from addiction problems.
- BANG! Showbiz