Due to an unspecified illness, Sarah Jessica Parker will not appear in Friday night’s performance of “Plaza Suite’’ at the Emerson Colonial Theatre, according to a Colonial spokesman.

Parker’s absence will reduce by 50 percent the star power of “Plaza Suite,’’ and is certain to be disappointing news to ticket buyers eager to see her perform opposite her husband, Matthew Broderick.

Broderick, who has been costarring with her in the pre-Broadway tryout of Neil Simon’s 1968 comedy, is scheduled to appear as usual on Friday night. Erin Dilly will play the roles usually played by Parker.

Asked whether Parker will be able to appear in the final two performances of “Plaza Suite’’ on Saturday, spokesman Robert Jones replied: “As this is an illness-related matter, we do not have any more information at this time. If we receive news of any absences for the final two performances, we will provide updated information when it is available.’’

News of Parker’s Friday absence follows the abrupt cancellation of Thursday night’s performance of “Plaza Suite,’’ shortly before the show was to begin. When asked Friday morning who took ill and the nature of the illness, spokesman Jones replied with a prepared statement saying only that “an illness’’ forced the cancellation of Thursday’s performance.


In a statement released after the Thursday night cancellation but before the news that Parker could not appear Friday night, she and Broderick said: “We’re absolutely devastated that this had to happen. We’ve felt such extraordinary hospitality and Boston’s warm embrace as well as the support of the theater community here, making disappointing tonight’s audience even more heartbreaking.”

Some ticket buyers had traveled considerable distances for Thursday’s performance, then had to pay Boston parking prices while missing the show they had come to see. Tickets are being “automatically refunded’’ to those ticket buyers, according to the statement.


All three remaining performances at the Colonial are sold out.

In addition to Broderick and Parker and Dilly, the “Plaza Suite’’ company (which includes regular cast members and standbys) consists of Danny Bolero, Molly Ranson, Eric Wiegand, Michael McGrath, Cesar J. Rosado, and Laurie Veldheer.

Don Aucoin can be reached at donald.aucoin@globe.com. Follow him on Twitter @GlobeAucoin.