melissa oxley could now breathe a little easier. while still on the radar, detectives never no longer considered her the primaries suspect in her husband ben's shooting death. they shifted their focus on another woman in ben's life. they believe she held a grudge. they brought her in for questioning and the story she would tell what's send the case in the stunning new direction. here again is keith morrison with "while they were sleeping". >> if you knew ben, there is no way that you would want him dead. i could not think of anybody that would want him dead, besides dawn. >> dawn, dawn oxley, ben oxley's ex-wife, alyssa's mother, even though -- ben's best friends told each other. >> everything in me said that dawn had something to do with that. >> of course, just a few years back, that sort of thing would've been unimaginable to dawn's best friends, scott and we sidney graham. not dawn, dawn the force of nature, the center of the room she's in. >> i don't know is manipulating, but everyone agreed with daw. if she was happy, we were

melissa oxley: horrible, knowing the person hello, i'm craig melvin, and this is "dateline." that youe you're shaken in the dead of night. >> horrible. knowing the person that you