Wladimir Klitschko has been left "deeply saddened" by the death of his ex, Hayden Panettiere, aged 36.
The 50-year-old former professional boxer broken his silence on the Heroes and Nashville star's passing, admitting Hayden - who gave him custody of their 11-year-old daughter Kaya - was still an "important part" of his life, despite no longer being his partner.