Police released audio of a 911 call placed by a personal assistant of former Miami Dolphins star Vontae Davis on the day he was found dead, RadarOnline.com has learned, revealing the woman who initially discovered the 35-year-old was left speechless by the tragic discovery. Davis was unresponsive in the gym area at his home in Southwest Ranches, a suburb outside of Miami when the woman stumbled upon him on Monday. In the audio, the operator asked if the woman could detail what she found, but the assistant noted she was still on her way to the residence owned by his grandmother where he was dis…