A popular member of the ER team, Kellie Martin played medical student Lucy Knight. She departed the emergency room in season six when her character was murdered by a schizophrenic patient on a rampage. What's the young actress been doing since then? In November 2006, Kellie and her husband, Keith Christian became proud parents of a baby girl, Margaret Heather Christian. Acting-wise, Kellie has starred in a number of Lifetime movies and plays a crime-solving bookstore owner in Hallmark Channel's "Mystery Woman" series. Kellie has even directed two of the ten "Mystery Woman" movies.