Missy Peregrym's character Maggie was missing during the first episode of FBI since that shocking onscreen death. The Monday, March 23, episode acknowledged Maggie's absence after serial slasher Ray DiStefano (Matthew Rauch) killed her sister, Erin (Adrienne Rose Bengtsson). Peregrym, 43, is expected to return in the March 30 episode of the hit CBS series as Maggie goes back to work after mourning her late sibling. "When you experience something so traumatic like losing a sister ...