Complete strangers did everything they possibly could to try to save Pernell "Sweet Pea" Whitaker's life after the ex-boxing champ was struck by a car ... and the frantic scene was all caught on 911 audio.
The 55-year-old was tragically hit by a vehicle while he was crossing a busy street in Virginia Beach on July 14 ... and in 911 recording of the incident, obtained by TMZ Sports, you can hear a woman rallying pedestrians to try to help Whitaker.
The woman says she didn't know Whitaker -- but saw he desperately needed help and vowed to do everything in her power to try and save him.
In the audio, you can hear the woman describe the dire scene, saying, "He is on the ground right now ... I'm not sure if he is alive."
But, when dispatch asks the woman if she's willing to administer CPR ... she doesn't think twice -- and tries to get others at the scene to help her.