Question: Who portrayed the character that replaced Shelley Long's character that she reprised on the spinoff "Frasier"?

Context paragraphs:
Roz Doyle: Rozalinda (Roz) Doyle is a fictional character on the American television sitcom "Frasier".  She is played by Peri Gilpin.  Roz is the producer of Frasier Crane's "Dr. Frasier Crane Show" on KACL 780AM.  Although initially reluctant to take the job, she and Frasier soon become good friends.

Diane Chambers: Diane Chambers is a fictional character in the American television situation comedy show "Cheers", portrayed by Shelley Long and created by Glen and Les Charles.  After her fiancé Sumner Sloan abandons her in the Cheers bar in the pilot episode, Diane works as a bar waitress.  She has an on-off relationship with the womanizing bartender Sam Malone (Ted Danson) and a one-year relationship with Frasier Crane (Kelsey Grammer), who later becomes a main character of the series and "Frasier".  When Long left the series during the fifth season, the producers wrote her character out.  Since then, they added her permanent replacement Rebecca Howe, a businesswoman played by Kirstie Alley, in the sixth season.  Shelley Long made a special guest appearance in the series finale as Diane.  Long also appeared in "Frasier" as Diane's fantasy counterpart in Frasier's dreams and the actual Diane in a crossover episode "The Show Where Diane Comes Back".

Frasier Crane: Frasier Winslow Crane is a fictional character on the American television sitcoms "Cheers" and "Frasier", portrayed by Kelsey Grammer.  Grammer received award recognitions for portraying this character in these two shows, in addition to a 1992 one-time appearance in "Wings".

Home Is the Sailor (Cheers): "Home is the Sailor" is the sixth-season premiere of the American television sitcom "Cheers".  It originally aired on September 24, 1987 on NBC.  It is also the first episode including the fictional character Rebecca Howe, portrayed by Kirstie Alley, as the permanent female lead.  It follows "I Do, Adieu", which was Shelley Long's last of her regular appearances as the female lead, Diane Chambers, who also left Boston on the show.

Rebecca Howe: Rebecca Howe is a fictional character of the American television sitcom "Cheers", portrayed by Kirstie Alley and created by Glen and Les Charles.  Rebecca appeared in 147 episodes of "Cheers" between 1987 and 1993 and in one episode of "Wings".  She debuts in the season six episode "Home Is the Sailor" after Shelley Long—who played waitress Diane Chambers—left the show to pursue a movie career.  Much of the show's humor in previous seasons had been based around the interaction and sexual tension between the womanizing, working-class main character, bartender Sam Malone, and the high-class, snobbish Diane.  Rebecca was intended to fill the gap as Sam's new female foil.

Lilith Sternin: Lilith Sternin (formerly Sternin-Crane) is a fictional character on the American television sitcoms "Cheers" and "Frasier", portrayed by Bebe Neuwirth.  The character first appears as a date for Frasier Crane, though mutual hostility and discomfort causes the evening to end badly.  Several months later, Lilith meets Frasier again and, with some help from Frasier's ex-fiancée, Diane Chambers (Shelley Long), they start a romantic relationship, eventually living together, marrying, and having a son, Frederick.

Sam and Diane: Sam Malone and Diane Chambers, collectively known as Sam and Diane, are fictional characters in the American situation comedy television series "Cheers".  Sam Malone is a working-class, retired baseball player-turned-bartender played by Ted Danson; Diane Chambers is a college-graduate cocktail waitress played by Shelley Long.  Danson appeared on "Cheers" for its entire run of the series; Long was part of the regular cast from the 1982 series premiere ("Give Me a Ring Sometime") until the fifth-season finale, "I Do, Adieu" (1987).  Long returned for a special appearance in the 1993 series finale, "One for the Road."

Night Shift (film): Night Shift is a 1982 American comedy film, directed by Ron Howard, concerning a timid night shift morgue employee whose life is turned upside down by a free-spirited entrepreneur.  It stars Howard's "Happy Days" co-star Henry Winkler along with Michael Keaton, in his first starring role, and Shelley Long.  Also appearing are Richard Belzer and Clint Howard.  A young Kevin Costner has a brief scene as "Frat Boy #1", Shannen Doherty appears as a Bluebell scout, Vincent Schiavelli plays a man who delivers a sandwich to Winkler's character, and Charles Fleischer has a brief role as one of the jail prisoners.

Sam Malone: Samuel "Sam" "Mayday" Malone is a fictional character on the American television show "Cheers", portrayed by Ted Danson and created by Glen and Les Charles.  The central character of the series, Sam, a former relief pitcher for the Boston Red Sox baseball team, is the owner and bartender of the bar called "Cheers".  He is also a recovering alcoholic and a notorious womanizer.  Although his celebrity status was short-lived, Sam retains that standing within the confines of Cheers, where he is beloved by the regular patrons.  Along with Carla Tortelli and Norm Peterson, he is one of only three characters to appear in all episodes of "Cheers".  Sam has an on-again, off-again relationship with the bar waitress Diane Chambers (Shelley Long) for the series' first five seasons until her departure from the series.  Then he tries to seduce Diane's replacement, Rebecca Howe (Kirstie Alley), who frequently rejects his advances.  Sam also appears in "The Show Where Sam Shows Up", a crossover episode of the spin-off "Frasier".

Shelley Long: Shelley Lee Long (born August 23, 1949) is an American actress.  She is best known for her role as Diane Chambers on the sitcom "Cheers", for which she received five Emmy nominations, winning in 1983 for Outstanding Lead Actress in a Comedy Series.  She won two Golden Globe Awards for the role.  Long reprised her role as Diane Chambers in four episodes of the spinoff "Frasier", for which she received an additional guest star Emmy nomination.  In 2009, she began playing a recurring role as DeDe Pritchett on the ABC comedy series "Modern Family".

Supporting paragraphs: Rebecca Howe Shelley Long
Answer: Kirstie Alley