shawn was getting violent. >> he broke into her apartment one night, came in through the bathroom window, threw her head up against the tile floor. >> reporter: brooke's family didn't know about any of this. the relationship, the alleged violence. it wasn't until after her death that her family finally learned brooke's secret. did that give you chills when you found that manila envelope? >> yeah, it was horrible. >> it was britney who discovered it as she went about the grim task of cleaning out brooke's apartment. >> we were getting things in order to pack away and send. and so i went in her kitchen. on top of the refrigerator was a manila folder. >> britney opened the folder.