keith morrison (voiceover): surely not easy going for the children of dave and debbie hawk. well, we do the best we can. that's all for this edition of "dateline." thanks for watching. woman: it was a small new year's eve party. hello, i'm craig melvin, and this is "dateline." we took off and then shortly thereafter we saw the police car. my gut was telling my feet to run back to that house. this can't be happening. narrator: when the party ended, the mystery began. it was just crazy. i didn't understand what was happening and why. narrator: his wife, the hostess, had seemed fine all night. then-- tom: my wife just shot herself in the head! please, help me! please help me! narrator: her death was ruled a suicide, but not everyone agreed. i always was afraid he was gonna hurt her. always, always. narrator: did a fight that night lead to something much worse? i knew that ashley wouldn't take her own life. narrator: a troubled woman, or a troubled marriage. interrogator: that wound on the back of her head isn't where she could do it herself, tom. it is not. oh! [bleep] narrator