Question: Who replaced Merrin Dungey as Naomi?
About the article "Private Practice (TV series)", section "Casting".

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Naomi was created by Shonda Rhimes, who wanted the show's central character Addison to have a close friend from her college days.
The character is based on a friend of Rhimes', who "married her college sweetheart and is strong and smart and funny."
Naomi was played by Merrin Dungey in the backdoor pilot episode "The Other Side of This Life", but was replaced by Audra McDonald prior to the show's first season.
Rhimes explained that the production team "wanted to put an edge on Naomi that we could define more clearly."
McDonald assessed that Dungey's dismissal was hard as a result of its having been so public, but commented that she herself had once been similarly replaced, having played Bill Cosby's daughter in the pilot episode of "Cosby", only to be replaced thereafter. 
Early life.
Dungey was born and raised in Sacramento, California, the daughter of Don Dungey, a general services manager.
As a child, she was active in ballet and dance as well as piano.
Dungey was also an accomplished ice skater.
Dungey graduated in 1989 from Rio Americano High School in Sacramento, California.
She earned a degree of Bachelor of Arts from UCLA.
Merrin Dungey has one sister, Channing Dungey, who is also deeply involved in the film industry.
Channing Dungey has worked for various studios including Steven Seagal's Steamroller Productions, Warner Bros. Productions, and is currently Senior VP of Drama Development at ABC Entertainment. 
On , it was announced by ABC that Merrin Dungey, who played the role of Naomi Bennett, would be replaced by four time Tony winner Audra McDonald.
ABC gave no reason for this change.
On , it was announced that a new character, played by KaDee Strickland, had been added to the main cast.
Tony Award Winner Idina Menzel appeared in two episodes during the second season.
Menzel was married to "Private Practice" star Taye Diggs.
David Sutcliffe, Jayne Brook, and Josh Hopkins also appeared in "Private Practice".
McDonald has also made many television appearances, both musical and dramatic.
In 2001, she received her first Emmy Award nomination for Outstanding Supporting Actress in a Miniseries or TV Movie for the HBO film "Wit", starring Emma Thompson and directed by Mike Nichols.
She also has appeared on ' (1999), ' (2000), "" (1999), the short-lived "Mister Sterling" (2003), "The Bedford Diaries" (2006), and "Kidnapped" (2006–2007), and in the 1999 television remake of "Annie" as Daddy Warbucks' secretary & soon-to-be wife, Miss Farrell.
She sang with the New York Philharmonic in the annual New Year's Eve gala concert on December 31, 2006, featuring music from the movies; it was televised on "Live from Lincoln Center" by PBS.
In 2013, she appeared in the HBO documentary "Six by Sondheim".
McDonald appeared as Naomi Bennett in "Private Practice", a spinoff of "Grey's Anatomy".
She replaced Merrin Dungey, who played the role in the series pilot.
McDonald left "Private Practice" at the end of season four.
In films, McDonald has appeared in "Best Thief in the World" (2004), "It Runs in the Family" (2003), "Cradle Will Rock" (1999), "The Object of My Affection" (1998), and "Seven Servants" by Daryush Shokof which was her film acting debut in (1996).
McDonald played Mother Abbess in the 2013 NBC live television production of "The Sound of Music Live!
". 
Dungey is a surname.
Notable people with the surname include:  Doris Dungey (c. 1961–2008), blogger  Lori Dungey (born 1957), actress  Merrin Dungey (born 1971), film and television actress  Ryan Dungey (born 1989), motocross racer