>> on top of the refrigerator was a manila folder. >> did that just give you chills? >> it was horrible. why didn't she tell us? >> did a secret lead to murder? >> it's got to be unimaginable. welcome to "dateline." when the body of brooke morris was discovered by the side of the road, her family started looking for answers. they were surprised to discover that she may have been involved in an allegedly violent relationship. could that revelation be the key to solving her murder? here with "nightfall" is andrea canning. >> i'd ask that you all close your eyes for a few minutes this morning. >> i'd like for you to envision rom county in the middle of october. the leaves are changing. there's a little bit of a nip in