they called the massachusetts police department handling the case of adam leroy lane arrested for that shane mcdunough. >> this is the state police. >> reporter: they rattled off questions for the local detective. they wanted to know if he had found receipts or anything in lane's truck thatne put him nea their victim in bloomsbury, the town that monica massaro lived and died the last weekend in july of 2007. >> the detective said wait a minute, did you say your town up in new jersey. we said, yeah. did you say the actual name of the town, bloomsbury. yeah, yeah, that's it. >> i have something here -- a receipt here that says bloomsbury. and at that point he said, what's the date? i gave him the date. and it was total silence on the other end of the phone. >> i remember we looked around. i looked at my colleagues at that point. the focus of the investigation changed, obviously. >> reporter: there it was, a receipt -- a purchase for a radar detector from a truck stop. just a scrap of paper, but it was a very promising lead for new jersey detectives trying to solve the murder of monica ma