so when debbie hawk vanished without a trace, her loved ones were left desperate for answers. stigators soon discovered that debbie was on the verge of exposing someone, and it may have cost the devoted mom her life. here's keith morrison. >> the key was waiting for them under the mat, that evening in june, 2006, outside their mom's house. silence. no one home. where was she? she was always on time to pick them up from their dad's place. but tonight he had to drive them. this just wasn't like her. where was she? conrad, the eldest, put the key in the lock, opened the door, chelsa, in the middle, crossed the threshold, stopped. what was this? >> once we took a few more steps in we realized there was something wrong. >> this was the moment, the defining one. nothing the same after this. >> and there was a lot of blood everywhere. >> then the adrenaline kicked in, instinct took over. >> we dropped our stuff. and split throughout the house. >> panic rising now. conrad was 15 now, his little sisters chelsa 14 and savannah 10. three kids trying to make sense of a horribly frightening

no debbie hawk. not anywhere. >> there was some drag marks, smear marks leading out to the garage where they stopped. her van was gone too. >> my initial reaction was my god what could have happened, who could have done this. they ran to a neighbor's house. they called 911. >> we went to my mom's room, the bathroom. there was blood. after the shock. i thought, let's not over reability. clearly, she cut herself with a knife or something and drove herself to the hospital. >> where was debbie hawk and what happened to her? what happened to the sacred bond that once held three children together. back in the beginning, even the police were confused. >> this case was very unusual from the start. this one did not smell right at all. >> it appeared she was drug out of the house. >> whatever happened here was planned. >> it looked like a staged crime scene. >> had somebody been trying to make it look like she had been kidnapped or just an intention to look like she left home. >> the bed was made. most crooks

. >> surely not easygoing for the children of dave and debbie hawk. >> we do the best we can. >> that's all for this edition of "dateline." thanks for watching. >>> good morning. i'm jo ling kent at msnbc world headquarters. here's what's happening right now. an unprecedented step and surprise summit. president trump visiting the dmz and doing something no other sitting american president has done before. this hour, the significance of that meeting and what kim told trump and the expectations for what comes next. >>> attacks on kamala harris getting support from her democratic rival after new onlineiv attacks. >>> defending biden, the new voices speaking up in support of the vice president. we begin with breaking news from the demille i tarized zone in north korea. president trump was the first u.s. president to step on north korean soil. it was the first time they've heard kim jong-un's voice speaking korean. >> the voice you will hear is the translator. >> good to see you again. i never expected to meet you at this place. [ inaudible ] >> you'll be the first u.s. president to cross. >