dr. rein returned home from a conference on friday evening, but his body wasn't found until sunday. investigators canvassed nearby farms. and? >> there was a neighbor that lived probably about a mile away, maybe a little less as the crow flies, that had seen an atv go by that night. and then said he heard two loud retorts about that time. >> that is, friday night. but -- it could've been that night or the next morning or something? >> at first he wasn't sure, and then he wasn't sure of the date. >> phone records showed the last time dr. rein received a phone call was at 10:15 on friday night. >> nobody heard from bryan after that last phone call on friday night. the thought that he would go all day saturday