Hayden Panettiere's ex-fiancé Wladimir Klitschko has spoken out for the first time since the star's death. The actress, who passed away on Sunday, had her daughter with the boxer, 50. In 2018, when Kaya was three, she signed full custody to her ex amid her battle with postpartum depression and addiction and Wladimir moved their daughter to his native Ukraine. A post-mortem examination showed there were 'no signs of trauma' - although her official cause of death, which came less than a week before her 37th birthday, is yet to be confirmed. It was revealed on Monday that Narcan, a nasal spray used to rapidly reverse the effects of an opioid overdose, was found on a mattress in a loft apartment where Hayden died. Naloxone, the active ingredient in Narcan Nasal Spray, blocks opioids like heroin, fentanyl, morphine and prescription painkillers from binding to brain receptors. It allows the person to start breathing again within two to three minutes and stays active in the body for 30 to 90 minutes. 'The announcement of Hayden’s tragic death saddens me deeply. She left this world far too soon. Hayden was, although no longer my partner, an important part of my life and the mother of our daughter, Kaya... 'She built an incredible career through immense talent, while also facing the darker sides of a very demanding industry. Nothing will erase the times we shared or the place she had in our lives... 'To our daughter Kaya, I will always speak of her mother with respect and make sure she remembers the person she was... 'I extend my deepest condolences to Hayden’s parents, her friends, and her fans, who are also grieving today. Young and talented people like Hayden should not leave this world so soon... 'I ask everyone to please respect our family’s feelings and privacy during this incredibly difficult time. For now, this is all I wish to say... 'Thank you to everyone who is supporting my family and expressing their sincere condolences... 'Rest easy, Hayden. May you find eternal peace.' 📷 Getty Images / Shutterstock / Instagram / AP #sports #boxing #news #haydenpanettiere - @dailymailsportusa