Michael Ausiello
June 11, 2010 AT 09:47 PM EDT

Image Credit: Inez Lewis/PR PhotosAfter weeks of negotiations, Maura Tierney has formally signed on to star in ABC’s new legal drama The Whole Truth, sources confirm. She replaces Joely Richardson, who quit the project earlier this month so she could spend more time with her family.

In Truth, which chronicles the building of a case from the perspective of both the defense and the prosecution, Tierney will play Kathryn Peale, a deputy bureau chief in the Manhattan District Attorney’s office. Numb3rs‘ vet Rob Morrow costars as Kathryn’s primary opponent, rising criminal attorney Jimmy Brogan.

Tierney attempted a TV comeback last spring on NBC’s Parenthood, but she was forced to drop out to undergo treatment for breast cancer. (Lauren Graham eventually replaced her.) Tierney’s cancer is now in remission.

Thoughts? Are you looking forward to seeing Tierney kick some arse in the courtroom? Sound off below!

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