Authorities are investigating the death of actress Hayden Panettiere. The investigation has expanded and now involves federal authorities looking into whether she obtained illicit drugs from a trafficker. Paramedics responded to a 911 call and found Panettiere in cardiac arrest, but were unable to revive her.

The cause and manner of her death have not been released, as toxicology test results are pending. Federal agents are involved in the investigation.

Further details about the investigation and Panettiere's death are available from the Los Angeles Times, which reported on the ongoing inquiry.