Jo Yeates: Murdered?

Joanna Yeates, a landscape architect in the UK, went missing a week before Christmas. Her parents plead for her return in this video, but sadly Jo was found dead Christmas day by some dog walkers.  Upon discovery, there was no sign of injury to Jo. Investigators are working to find out what happened.

Many people were suspicious of Jo’s family. While I have only seen the parents speak, I do not find anything suspicious in their behavior. Their sadness is palpable, and while they speak in past tense of their daughter after only six days, it does not raise a red flag to me in any fashion. I have seen other cases where people refer to missing loved ones in past tense.
Thanks for the topic suggestion.  If anyone sees the boyfriend speak, please let me know.