Hayden Panettiere, the ex-fiancé of former heavyweight champion Wladimir Klitschko, has died at the age of 36. She was a successful actress in her own right. Panettiere's father, Skip, announced the actor's death in a statement provided to ABC News Sunday. No cause of death was announced, but it was well documented that Panettiere struggled with alcohol and depression. She and Klitschko had a daughter together in 2014, with Panettiere eventually choosing to give full custody of her daughter to Klitschko. Boxingtalk sends its condolences to the friends and family of Hayden Panettiere.