Hayden Panettiere’s cause of death was released on Monday, weeks after the "Nashville" and "Heroes" star died. According to TMZ, Panettiere is believed to have died after taking an oxycodone pill laced with fentanyl. The outlet reports that she had a longtime drug dealer in Los Angeles who allegedly supplied her with black-market prescription drugs, including oxycodone. Follow this story and more on FOX 7 Austin, on air, online and on FOX Local. #haydenpanettiere #haydenpanettieredeath