I followed a case a while ago on here. The Kayleah Wilson case and when her body was found the FBI released a list of things to look for in the perp. I thought it might be helpful to share them on this case. Different cases but the behavior changes would be similar.
The two I bolded are in my opinion very important. The perp would of acted differently the day they went missing and now that they have been found is probably acting different.
Behavioral Changes
FBI Agent-In-Charge James Davis released a list of behavioral changes in a person that might point to someone involved in Kayleah's disappearance.
Among those possible changes that might re-manifest themselves now that the body has been found:
Coming up with an excuse to leave the area unexpectedly for what may sound like a good reason. (work-related, visiting relatives)
Missing work, calling in sick, asking to change shifts, particularly on days close to the night Kayleah disappeared or after the body was discovered.
An unexpected or sudden interest in the status of this investigation. Paying close attention to the media, or avoiding participation in any conversations or activities related to this case.
Minimizing or denying a known acquaintance with Kayleah.
A recent display of nervousness or irritability.
A recent increase or decrease in expressing religious beliefs.
Changes in routine sleep patterns.
Changes in their usual consumption of alcohol, drugs or cigarettes.
Shaving off facial or head hair, or growing a mustache or beard.
No longer driving, or
changing the appearance of his personal or work vehicle for no obvious reason. Leaving it parked in a shed or garage. Covering it, painting it, selling it or reporting it stolen. Giving it away.
Davis said that if an individual exhibits some of these changes, it doesnt necessarily mean that theyre involved in some kind of crime, but he wants the public to be aware of the possibility.
http://www.thedenverchannel.com/news/kayleah-wilson-s-boyfriend-arrested