Investigators say there's one piece of key evidence they've yet to find in Alexis Murphy disappearance

POSTED: 06:00 PM EDT Aug 13, 2013    UPDATED: 07:56 PM EDT Aug 13, 2013 

At this point, Murphy's cell phone is still missing. Investigators tell us they know they have their guy but they are still looking for crucial pieces of evidence, like that phone, to help find her.