India, Aug. 18 -- Hayden Panettiere's sudden death at 36 has brought renewed attention to the devastating reality of substance-related deaths among high-profile celebrities. The Heroes and Nashville star was found unresponsive at a residence in Greenville, South Carolina, on August 16, with a 911 call describing an apparent overdose and cardiac arrest.

However, it is important to distinguish between an apparent overdose reported during the emergency response and an officially confirmed cause of death. The Greenville County Coroner's Office has said Panettiere's autopsy found no signs of trauma contributing to her death, while her official cause and manner of death remain undetermined. Authorities have also reported no signs of foul play....