his case for a staged crime scene. jewelry left on the kitchen counter, the murder weapon suspiciously moved, and a slashed window screen in the garage. >> burglars, intruders don't usually cut a screen because they know you can just pry a screen off very easily. i think it's just a part of staging. >> next, the dallas county medical examiner described darlie's wounds as superficial and potentially self-inflicted. >> they didn't go deep. just a straight slice across this way, that's why we call them superficial wounds. if there was really a killer in there doing those things to those boys, he would have stabbed darlie routier multiple times through the chest just like the boys and she would be dead. >> they also focused on blood spatter from the two boys found on the back of her night shirt. >> our expert was able to demonstrate how that happens, if you're kneeling over someone and stabbing them. just showed you come up and when it comes up is when the cast off happens.