Wladimir Klitschko mourns former fiancée Hayden Panettiere, vows to keep her memory alive for daughter Kaya

Panettiere’s tragic death on Monday prompted an outpouring of grief from fans around the world.

Klitschko shared an image of their daughter happily sitting on her mother’s shoulders as he paid tribute to Panettiere’s “incredible career through immense talent, while also facing the darker sides of a very demanding industry.”

The message also referenced the troubles that the Nashville and Heroes actor had experienced at a young age, following a succession of child stars who faced later challenges or tragedy.

Hayden Panettiere's ex-partner Wladimir Klitschko has posted an emotional tribute to the "talented" late Heroes and Nashville star, who he said has "left this world too soon".