A bright and promising third-year resident, Knight is put through her paces by her resident advisor, Dr. John Carter. The tension mounts between them as the line between their professional and personal relationships begins to blur. Passionate and often stubborn, Knight will go to any lengths to help her patients -- even though her methods are sometimes a bit unconventional.

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.