Stephanie Niznik Stephanie Lynne Niznik is the actress who first portrayed the Trill Starfleet Ensign Kell Perim in the feature film and later the humanoids form of a Wraith in the episode . Niznik is probably best known for her role as mad bomb planter Caitlin Sweeney in four episodes of " Diagnosis : Murder " ( 1998 ) and for her role as Nina Feeney throughout the run of the drama series " Everwood " ( 2002 - 2006 ) . Niznik was born in Bangor , Maine and received her Masters of Fine Arts from the Duke University in Durham , North Carolina . Shortly after her debut in the comedy " Exit to Eden " ( 1994 , with Iman , Rosemary Forsyth , Keegan de Lancie , and Rachelle Roderick ) , she landed the part of Agent Judith Phillips in the short lived action series " Vanishing Son " ( 1995 ) , where she appeared alongside guest actor Jason Leland Adams . The following years she guest starred on the television series " Renegade " ( 1995 ) , " Murder , She Wrote " ( 1995 , with Madlyn Rhue and William Windom ) , " The Sentinel " ( 1996 ) , " The Guardian " ( 1997 ) , " Dr . Quinn , Medicine Woman " ( 1997 , starring Joe Lando and Chad Allen ) , " Sliders " ( 1997 ) , " JAG " ( 1997 , with David Coburn and Jim Fitzpatrick ) , " L . A . Doctors " ( 1998 , with Eric Menyuk and Whoopi Goldberg ) , and " Profiler " ( 1998 , with Mark Rolston ) , and played supporting parts in the comedy " Dear God " ( 1996 , with Jack Sheldon and Valerie Wildman ) , the television drama " Apollo 11 " ( 1996 , with Jeffrey Nordling , Jim Metzler , Matt Frewer , Tim Kelleher , and George Murdock ) , the drama " The Twilight of the Golds " ( 1997 , with Jill Lover ) , the action film " Memorial Day " ( 1998 , with Rob LaBelle ) , the television thriller " Mr . Murder " ( 1998 , with Julie Warner , Bill Smitrovich , K Callan , Richard Riehle , and Bertila Damas ) , and the television comedy " Emma ' s Wish " ( 1998 , with Seymour Cassel and Dennis Cockrum ) . In 1998 , Niznik portrayed Erika , the female lead , in the television action film " Inferno " , which featured Sharisse Baker - Bernard , Stoney Westmoreland , and Denney Pierce , followed by ' s short film " Kismet " ( 1999 ) opposite Mariette Hartley . Niznik also had guest parts in the television series " Viper " ( 1997 and 1999 , with J . Downing and Paul McGillion ) , " Nash Bridges " ( 1999 , with Cliff DeYoung and Scott Trimble ) , " Family Law " ( 1999 , starring Julie Warner and Christopher McDonald and with Mark Moses , Gregg Henry , and James Avery ) , and " Diagnosis : Murder " ( 2000 ) . After a featured part as a waitress in the drama " Anywhere But Here " ( 1999 , with Faran Tahir and Jay Harrington ) , Niznik took over the leading parts in the television science fiction film " Epoch " ( 2000 , with Brian Thompson , Craig Wasson , and Michael Cavanaugh ) and the horror film " Spiders II : Breeding Ground " ( 2001 ) . Prior to her " Everwood " and " Enterprise " performances , she played a reporter in the acclaimed drama " Beyond the City Limits " ( 2001 , along Benjamin Lum , Brian George , and Morgan Margolis ) . After the cancellation of " Everwood " , Niznik filmed the mystery drama " The Twenty " ( 2007 , starring Clancy Brown ) and episodes of " Grey ' s Anatomy " ( 2007 , with Raphael Sbarge and Becky Wahlstrom ) and " Traveler " ( 2007 , with Steven Culp , Billy Mayo , Neal McDonough , and William Sadler ) . More recently , she portrayed Jo Weller - Clarke in the comedy series " Life Is Wild " ( 2007 - 2008 ) and guest roles in " CSI : Miami " ( 2008 ) , " Eli Stone " ( 2008 , with James Saito , Melinda Clarke , and Mark Casimir Dyniewicz ) , and " NCIS " ( 2009 , alongside Martha Hackett and stuntman Panuvat Anthony Nanakornpanom ) .