I just wonder why it is only 2nd degree murder. That to me means he might not have been the person that committed the actual crime. Maybe he just helped dispose of her body?
I just read that first degree is more of a planned murder and second degree is more like a murder committed during a fight (not planned).
Speculation: Or he is just one of more. We know that LE suspected at least one more person, someone who may have picked up the murder or dumped the car. Maybe he was the driver? More arrests pending?