but her bioyfriend, spencer hoo, also stopped by. something rosser probably didn't anticipate. this forced rosser to wait another three hours. >> i love you. >> i love you too. >> spencer left shortly after midnight. but he called jenna at 12:47 to say good night. after that call, jenna went to bed. and at some point, rosser attacked. jenna fought for her life. scratching him, collecting his skin cells. he strangled her to death. tiny drops of rosser's blood landed on jenna's shirt and on the rug next to her body. >> i would like to say that jenna in her last moments, i guess, fought like she always fights. and she's been a fighter. and that was enough to help us identify who this person was so that we could try and achieve some small sense of justice for her and her family. >> when charged with jenna's murder, rosser admitted he was guilty, in order to spare his family the ordeals of a trial. rosser never revealed his motive. >> it's possible that jeremy entered jenna's apartment to burglarize and it then once spencer left, jeremy may have exited the bedroom hoping to get whate