Hayden Panettiere's possible cause of death revealed: report

Key Points:

• Hayden Panettiere is believed to have died from taking an oxycodone pill laced with fentanyl, according to TMZ, which also reports that she had a longtime drug dealer supplying her with black-market prescription drugs in Los Angeles.
• The Drug Enforcement Administration is investigating the alleged dealer as authorities work to trace the source of the fatal pill, though toxicology results and an official cause of death have not yet been confirmed.
• Panettiere died on August 16 in Greenville, South Carolina, after being found unresponsive and in cardiac arrest; emergency responders were unable to revive her, and preliminary autopsy found no signs of trauma or foul play.
• The actress was known for her roles in "Heroes," "Nashville," and several films, and had recently released a memoir discussing her struggles with addiction, depression, and custody of her daughter who lives in Ukraine.
• Tributes have poured in from fans, colleagues, and SAG-AFTRA, mourning her sudden passing and honoring her legacy in the entertainment industry.