Well that's odd. If the nephew saw B in the car 8:10 AM (alive I assume), what happened after that? If she was alive, he would have had to kill her in the car (vs. out in public). Meaning the chances of a dead body in the car are pretty great.
1 - if he killed her prior, then put her in the car "sleeping".
2 - if he killed her in the car, then dumped her
Wouldn't a cadaver dog hit on that pretty quickly? I have a hard time wrapping my head around him killing her somewhere else then dumping her. That wouldn't be an accident (beating) IMHO.
MOO
Mel
I think she was too badly beaten to explain away, and she had to be taken back to her mother. I think he had been stalling on this. I think he kept her longer than expected.
I don't think he killed her in the car. I think he wanted to make it look like kidnappers had her, leading investigators away from the site oh the abandoned car. He could have dropped off the nephew and gone to a secluded area of the park, near the river, or into an abandoned warehouse somewhere, strangled her and then dumped her.