Lucy Knight

Lucy Knight
Kellie Martin as Lucy Knight
First appearance	September 24, 1998. (5x01, "Day for Knight")
Last appearance	February 17, 2000. (6x14, "All in the Family")
Portrayed by	Kellie Martin
Information
Occupation	Physician
Title	Medical Student (1998-2000)
Family	Barbara Knight (mother) Mr. Knight (father)
Born	1975

In the NBC television series ER, the fictional character Lucy Knight is a medical student portrayed by actress Kellie Martin. The character was part of the show for the 5th and 6th seasons. When she was first introduced on ER, Dr. Doug Ross called her a "by the book" medical student. Kellie Martin's image was removed from the main cast opening credits in the 15th episode of season 6.

Prior to this role in ER, Martin called herself "One Take Kellie". She was not used to the medical jargon her character had to say, and claimed that it once took 12 takes to correctly pronounce "renal vein thrombosis."

During season 5 she was a third-year medical student. Dr. John Carter was quickly assigned as her resident while she completed her emergency room rotation. Knight and Carter varied between respectful and contentious interactions.

At the beginning of her rotation at County General, she was popular with the attendings and nurses, who often treated her as another colleague. Lucy does run into trouble with Nurse Carol Hathaway after she asks for help with an IV. Lucy, unable to start an IV asks Carol for help and doesn't own up to Carter that she can't start one until they end up in a trauma where she admits the truth. Carter was furious at her for lying to him and said if she ever did so again she would be off his rotation permanently, and the relationship between them was never quite the same. Lucy wound up in trouble with Carter again after a Halloween party at her med school gets out of control and two students nearly die. Angry about work that has been thrown at him at the last minute, Carter leaves Lucy in charge of the party even though, as RA, that is his responsibility. Carter blames Lucy for him losing his RA position and they fight again when Carter overrules her on a case where Lucy's judgment was correct, with Lucy then making comments on her Palm Pilot that Carter accidentally hears that describe his condescending treatment of her. Carter and Lucy eventually come to an agreement after the episode "The Good Fight" when the pair spend a day and evening searching for a little girl's father who has the same extremely rare blood type as she does.