I think the most likely scenario here is going to end up being that Cheryl did in fact leave her badge at home, she did park her car, and she did send a text to her friend. As she was typing out the text or shortly afterwards, she saw someone she knew or they pulled up right next to her there on the street. She may have rolled her window down in order to explain to said person that she had left her badge at home and had to lose her parking spot in order to go get it. Said person said, "Hey, I'm heading over that way, hop in and I'll run you over there and back". Not wanting to lose her parking spot, or simply because she knew and trusted this person, she agreed and exited her vehicle and got into theirs. Maybe a plan was formulated between them where they would ride the bus together after running around to gather her badge and whatever else the driver needed to get done.
After she got into this persons vehicle, the inner demon in him surfaced, the psychotic side emerged, and everything went downhill from there. The lure of having a defenseless woman in his car, a woman that no one knew was in his car, completely overwhelmed his sense of morality. This may have also been a planned action. Somehow he was able to restrain her, be it with a knife, a gun, or a blow to the head. This would have been done a very short time after she got into his vehicle, because her phone was shut off just a few minutes after the text to the friend was sent. This attack may have happened so quickly and so unexpectedly that Cheryl herself never even realized she was in any danger.
I don't believe she was killed during that trip... Nope... I think she was taken somewhere and held for awhile, at least a day or two. Keep in mind here, your're dealing with a psychotic nutcase that nobody realizes is a psychotic nutcase. This is probably going to end up being a fantasy based crime, and really had nothing to do with Cheryl herself, any woman willing to get into his car would do. This was a crime of opportunity and a spur-of-the-moment decision on his part.
So who are we looking for ??
A) A male age 30-40
B) Someone who lives in her community and knows her personally or knows some of her friends or family.
C) Lives alone, introverted and awkward when dealing with women, reclusive, may be viewed by some
people as being a little "weird" or "off".
D) Missed work completely on 2/8, called in sick, or came in extremely late.
F) Has no history of arrests or violent crimes (that people are aware of).
G) Uses the Park and Ride facility often, possibly daily.
H) Has a garage at home that is remote control activated.
This is going to end up being someone she knew, or thought she knew. She may have just known him by association. It's going to prove to be a huge undertaking, but the cops need to try and figure out who showed up late for work that morning or who didn't show up at all. That may or may not be productive, because the person we are discussing here may have had the day off and was actually out trolling for a victim that morning. This may not turn out to be quite as random as it appears on the surface. All this person needed to do was manage to get a woman, any woman, into his car and the plan went into action.