Police interviewed and then released the unnamed woman who drove the car that took Eric Holder away after he killed Nipsey Hussle, suggesting they bought her story that she had no idea what had just transpired.

However, an unreleased video which TMZ has viewed paints a different picture.

You see the shooter race down an alley to the waiting car. The killer stops at the car for a second, then gets inside the passenger seat and the driver floors it. It's apparent from the video ... the driver was waiting to bolt from the scene.

TMZ also reports that their sources still believe Holder's motive was anger from Nip calling him a snitch. Although they say that the initial conversation between Holder and Nip ended amicably.

Our sources say when the car initially rolled up to The Marathon Clothing store, Holder was driving and the woman was the passenger. We're told Holder parked in the mini-mall parking lot next to the store. As the woman waited in the car, Nipsey and Holder had their initial conversation, in which Nipsey rebuffed him after suggesting he was a snitch -- which Holder denied.  

Contrary to some reports, we're told the conversation continued without animosity. The 2 engaged in some sort of friendly hand gesture, after which, Holder walked over to the burger joint in the same mall, ordered something and eventually got in the car and left.

We're told the car returned a short time later to a street that is connected to the alley that leads to the mall. The woman was driving and Holder was a passenger. We're told after Holder got out and walked toward the mall, she kept the car running and waited for him to return.

As for why the police released the woman ... law enforcement sources tell TMZ "Sometimes you have to give a little to get a lot."

The implication being that the woman is working with the police.