>> you know, i check them out and said you girls be safe, you're okay right? >> and she said yes, will be good. >> and, a little before 10:30 pm, she walked out into the night, happy, a little tipsy. altogether, unaware of what was waiting on the other side of midnight. >> coming up >> a friend of cam's, texted him and said your girlfriend is here dancing with another guy. >> clearly out for a night of fun. but where would she be in the morning came. >> the very first message that i looked at was from cam saying, have you seen kayleigh? >> instantly, i had this sickening feeling in my gut. >> when dateline continues. bear hug betty. settle in kids, you'll be there a while. ooo, where you going?