Hayden Panettiere tributes include Viola Davis, Selma Blair and Melissa Barrera

Stars are mourning the loss of actress Hayden Panettiere, who passed away at the age of 36. Among those paying tribute to the talented performer are fellow actors Connie Britton, Viola Davis, Melissa Barrera, and Bethany Joy Lenz. Panettiere, known for her roles in "Heroes" and "Nashville," had been open about her battles with alcohol addiction and postpartum depression. Her former partner, Wladimir Klitschko, also shared heartfelt tributes to the beloved actress.