>> one of the first things we found out about was the facetime conversation between both brumbacks and their daughter. and they were roaring with laughter at one point. so much that the daughter took a screenshot of the conversation. that's the kind of stuff that humanizes this, that makes -- you realize that this was just a lightning bolt in the middle of an otherwise normal mother's day. >> reporter: carol brumback, roger's sister, also spoke with her brother that afternoon. then two days later, a family member broke the awful news. >> well, he said, "roger and mary were murdered." and i said -- i said -- i said, "what are you talking about?" and he said, "they were murdered." >> reporter: what goes through your mind? >> you know, i had no idea. i had no idea, you know, what had happened. >> reporter: carol couldn't imagine who might want to kill her brother. although well off, she says he and mary had lived modestly.