jill mccluskey: lauren kept saying, well, the police will handle it. diamond: we got the notification on our phone saying, lockdown at the u. jill mccluskey: he had been lying in wait. i was like, this isn't real. this isn't happening. how do you not recognize that this girl needs your help? what should scare every parent is that this could be going on at any campus across our country. [music playing] hello, and welcome to "dateline." college senior lauren mccluskey was known around campus as a star athlete, but few knew that off the field, she was trapped in an abusive relationship. lauren turned to campus police for protection not once, but several times. most of us would agree it was the right thing to do. so why did things turn out so very wrong? here's josh mankiewicz with "lauren's promise." [marching band playing] josh mankiewicz: graduation at the university of utah in salt lake city, home of the utes-- a time for selfies, smiles, and celebration. go, utes! josh mankiewicz: in may 2019, 8,500 graduates and their families packed the university's