Katherine Heigl portrayed a fictional person created by Melinda Metz .
Isabel Evans is a fictional character created by Melinda Metz for the young adults book series Roswell High and adapted by Jason Katims for the 1999-2002 American science fiction television series Roswell . Katherine Heigl . From 1999 to 2002 , Heigl co-starred as Isabel Evans on the television series Roswell . Roswell (TV series) . The series is based on the Roswell High young adult book series , written by Melinda Metz and edited by Laura J. Burns , who became staff writers for the television series .