no doubt in our mind that it was miriam helmick. >> miriam was confronted with the surveillance image. >> she did admit to placing the card at her house. her explanation was to get law enforcement to refocus on the investigation and be more active. >> now, suspicious investigators searched miriam and alan's computer hard drives for possible clues. >> they had two distinct computers side by side. alan used one. miriam used one. >> people tend to be very intimate with their computers. they will ask it questions through google that they would not ask another human being. >> and investigators soon learned that miriam had been searching the internet for all sorts of interesting information, especially about the prescription drugs alan had been taking. >> i recovered approximately 180 online medical searches for things such as viagra overdose. ambien overdose, lisinopril overdose, a combination of those three drugs mixed together, pain killing overdoses. >> i think she was looking at various ways to kill alan. >> investigators also learned miriam would benefit handsomely as a result of alan