>> reporter: four days after the brumback murders, this investigation got one more jolt. another pathology professor from crieghton reported that around 2:19 p.m. on mother's day someone had tried to force their way into her house, setting off the burglar alarm. fortunately, dr. channda bewtra and her husband were out for a mother's day lunch at the time. >> it made that theory of ours even stronger. that now we have two crimes, and potentially there would've been another had they been home. >> reporter: this is what dr. bewtra told nbc affiliate wowt-tv. >> we get there, there was no damage. nothing was missing. everything was as it was. >> reporter: a week after the