Drug Enforcement Administration Has Joined the Investigation Into the Death of Actress Hayden Panettiere, Sources Familiar With the Matter

Panettiere, best known for her roles in "Heroes, "Nashville" and the "Scream franchise, died on Sunday at age 36 at an apartment complex in Greenville, South Carolina. The actress's death is being investigated by local authorities, with the DEA now lending its resources to the probe. No further details about the investigation or the circumstances surrounding her death have been released.