Hayden Panettiere's cause of death revealed one month after star died aged 36

Hayden Panettiere's memorial tributes revealed following emotional celebration of life in Malibu

Ruby Rose breaks down over death of 'best friend' Hayden Panettiere at Malibu memorial: 'We spoke every day for five years'

Pictured: Hayden Panettiere's friends Connie Britton and Beverly D'Angelo lead stars paying tribute at Malibu memorial ceremony