>> it's the worst feeling, thinking you're gonna be blamed for your husband's death. >> could she have been the killer? or, with someone keeping a secret? >> he said, what did you do. what did you do? >> i don't know what to tell you. >> just of the truth. >> hello, and welcome to "dateline". it's the stuff of nightmares. and a traitor creeps into your bedroom in the middle of the night and opens fire. but for melissa oxley, the bad dream was all too real. she told investigators she'd been startled from her sleep to find her husband, ben, dead from a gunshot blast. it seems streams, they thought, that no one else in the house was hurt. including melissa, who was sleeping by his side.