sandra whitney is a good friend of alex's parents, she is paige's mom. >> they had gone off for a weekend vacation and they had been texting that evening and becky t was sending her picture of their hotel room, you know, you get to a hotel, hey look. alex didn't respond. and she tried over and over again and she didn't respond. and that's not how their relationship worked. you text, you call, you always responded. >> is that llunusual that she wouldn't respond in college? it's a weekend. her boyfriend is coming for the weekend. >> i imagine the first couple times, maybe she wasn't concerned, but when it was several, that's what raised flags. >> a little bit of mother's intuition, do you think? >> i imagine it was. >> alex's mom worked the phone frantically trying anyone who might know where her daughter was. finally at 2:42 a.m., she called the campus police to ask her to go to her daughter's dorm room to check on her. officer michael johnson responded. >> you took that call? >> i did. >> you headed over to the dorm. >> yes. >> and then what happened? >> we went there. i knocked on the do