Watch : Hayden Panettiere Privately Entered Rehab Weeks Before Her Death

More information about Hayden Panettiere's final moments have come to light.

Nearly two months after the Heroes alum died at age 36 as a result of drugs in her system, details from the 911 call placed by her on-again-off-again boyfriend Brian Hickerson's brother Zach Hickerson reveal what happened before first responders arrived at the South Carolina apartment complex where she was residing.

 I walked in after church to my brother and his girlfriend's apartment, and he woke up, and his girl,  a frantic Zach said to the dispatcher in the audio, which was obtained by ABC News and CBS News through a Freedom of Information Act request to Greenville County EMS,  she's unconscious. 

After confirming that Hayden wasn't breathing, Zach-who, due to South Carolina FOIA laws, was not named in the audio-was instructed to start life-saving measures.

 I'm going to tell you how to do CPR,  the dispatcher said.  We're going to start with ventilation first. I need you to lay her flat on her back and remove anything from under her head. 
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