It was the seventh series to be renewed by the network, behind solid performers Heroes and Law & Order: Special Victims Unit.

News on the series' return did not come until December 2007 when NBC announced that the fourth season would begin in January in its original Monday 10 p.m. time slot, despite the WGA Strike of 2007, which forced the show to cease production, allowing for only nine episodes to be filmed.

While struggling to balance the ever growing media attention and the visions that haunt her, Allison meets Cynthia Keener (Anjelica Huston), an investigator with "Ameri-Tips" who personally hires her to help solve crimes under the table.

In a shocking twist, Cynthia murders her daughter's killer but immediately calls the police, accepting the consequences of her actions.

At the end of the season, a sense of order is restored when Van Dyke steps down after being given only a few months to live due to cancer.