OK, I found a video that explains what happened in the Brooke Wilberger case. Yes, the abductor and murderer in that case had been stalking while in his vehicle, young women on the college campus and in another state prior to the murder of Brooke. Also said in this video, that a knife was held to Brooke at the very beginning of the abduction.
http://www.youtube.com/watch?v=ScHlYs1SBNE
True, he had been stalking from his vehicle. But, prior to his abduction of Brooke he had a very lengthy record of violent acts of sexual assault, including rape charges stemming back years and years.
From what we know of this RSO, he has never been charged with rape, and his previous crimes date back to more than 10 years ago. Thus far, his crimes show no pattern of escalation, Brooke's murderer had a very long, and clear pattern of escalation.
Please, do NOT misunderstand me, I'm in no way defending this RSO I'm just of the opinion that this is not his M.O. That is just my opinion and I'll leave it at that.