Drug Enforcement Administration joins probe into Hayden Panettiere's death: Sources

The Drug Enforcement Administration has joined the investigation into the death of actress Hayden Panettiere. The star of Heroes and Nashville passed away on Sunday at the age of 36. According to the Greenville County Coroner's Office, Panettiere was found in cardiac arrest before her death. Authorities are currently probing the circumstances surrounding the incident as the DEA provides additional support to the ongoing inquiry into the cause of the actress's sudden passing.