Your last comment about the witness seeing O.J. driving away from (near) the scene of the murders is something I've always wondered about. She sold her story for something like $5k, but her testimony could've been very helpful to the prosecution. It's too bad she couldn't see the long game.
I did not read about this woman’s story until after the trial was over. Apparently she was driving home and was going through an intersection a block or two away from the murder scene. An African American man driving a White Bronco went through the intersection failing to stop at the stop sign almost causing a collision with her vehicle. She reported this story to the police but also sold it to the National Enquirer(or some other media outlet). Therefore, she never was called to testify at the trial.
From what I recall she was pretty sure that the man driving the vehicle was OJ. How well she would have done under cross examination by the best attorneys in the country would have been interesting to see. I am sure they would have investigated her, just like Mark Furhman to see if she had ever used the “N” word or might have been drinking that night, etc. Maybe she would not have made a good witness. We will never know.