The Chicago Opera Theater has announced a cast change for “Soldier Songs” one week before performances start.

The company revealed that Nathan Gunn had to withdraw from the production due to a family emergency. In his stead, David Adam Moore will jump in. He sang the opera previously with a number of companies and appeared in commercial recording of the work from 2013.

Moore is currently working on “Dead Man Walking” at the Metropolitan Opera and will receive permission from the company to jump into this production. He is slated to arrive on Oct. 4. The opera opens the next day.

“I’m very sorry that Nathan Gunn will be unable to join us next week in Chicago, but grateful that the Metropolitan Opera has released David Adam Moore to step into the role,” said composer David T. Little in an official press statement issued by the company. “David is among the leading interpreters of my music. His countless performances of ‘Soldier Songs,’ beginning in 2008, show him to be a singer of remarkable depth, intelligence, and skill. He knows the role better than anyone, and I’m excited for the COT community to hear him bring it to life.”

The opera will be conducted by Lidiya Yankovskaya, the company’s Elizabeth Morse and Genius Music Director.