Actress Maura Tierney has exited TVs “Parenthood” (it’s a mid-season spin-off of the twenty-year old Ron Howard movie) due to health reasons.

According to Variety, NBC had already pushed back the series from fall to midseason to give the star time to undergo treatment for Breast Cancer.

The network said Thursday that while Tierney (best known for her role on TVs “E.R”) is likely to recover, her treatment plan conflicted with the production schedule for the series. As a consequence, the network will recast her part (Marisa Tomei is rumoured to be in the mix).

“While we are saddened that Maura Tierney won’t be able to continue in her current role in ‘Parenthood,’ our main concern is for her quick and full recovery. Our thoughts and best wishes are with her,” the Peacock said in a statement.

The cast of the show includes Peter Krause, Craig T. Nelson, Dax Shepard, Bonnie Bedelia, Monica Potter, Erika Christensen and Sarah Ramos.