Maura Tierney, who played nurse Abby Lockhart on NBC's medical drama ER
for a decade, is exiting the network's new fall drama Parenthood
as she continues to undergo treatment to battle breast cancer.
Maura's role as Sarah, one of four adult children born to a pair of eccentric parents, will be recast, NBC confirmed on Thursday.
In July, NBC postponed production on the show for eight weeks to allow the actress time to