>> he said i don't know, but my car was broken into at work last week. >> his cadillac. the break-in happened on the night of may 17th, just a few hours before earon harper was found dead. >> i asked him, where do you work? and he said he's a pharmacist at a walgreens and bells and whistles go off in my head. he works in a drugstore where they sell prescription drugs. it hit me immediately that there was a reason that manual was with this stuff now. >> detective arnold had a working theory you now and it went like this. someone broke into a shiny cadillac parked outside an indiana walgreens. it happened to belong to the store's pharmacist. for no apparent reason, the thief grabbed the owner's manual from the glove compartment and tossed it into his own car. he then went to earon's house, where she and erica were shot and earon's prescription pills and credit cards were stolen. then, according to rick's