The 60-year-old told The Sun that the family had "lost an angel", but that the death of 25-year-old Louella Michie was "not murder".
He told the paper: "We've lost our angel. It's not murder - they were friends. It was just a tragic mistake, a tragic accident.
"She touched so many lives. She was so very positive, so bright, so out there. She had such energy. The tributes to her have been incredible."
In a statement, Michie's agent said: "Sadly, I can confirm the tragic death of John Michie's daughter Louella at Bestival.
"John and his wife Carol ask that the privacy of their family be respected at this traumatic time."
Source: Irish Examiner