Maja,
Exactly, what I was thinking, if he did not know what she was wearing would he have bothered to notice if the phone and keys were left behind. I also read the phone and keys were in the X5. You are right, if BC killed NC it would have been easy to call himself from her phone and lock it back up, another way he could have formed an alibi, if he needed to. As far as cleaning goes, who knows he may have been trying to help out so it would help him later on, or maybe he was trying to work with her. I think NC had the phone with her when she was killed, if not why was it locked? You lock an open face phone such as Blackberry when you put it in your pocket so as not to pocket page someone, it would have made sense for her to lock it before she went jogging, but to leave it laying around locked is strange. If the phone was in fact in the car, that is very telling.