The Drug Enforcement Administration has joined the investigation into Hayden Panettiere’s death, according to ABC News. The 'Heroes' and 'Nashville' actress dies at age 36 on Sunday. Key points and original sources are listed below.

• The Drug Enforcement Administration has joined the investigation into Hayden Panettiere’s death, according to ABC News. The DEA is entering a joint effort with South Carolina’s Greenville Police Department and the local coroner’s office, according to TMZ. Pane...S1

• The 'Heroes' and 'Nashville' actress dies at age 36 on Sunday.S2