Katherine Anne "Kitty" Walker McCallister is a fictional character on the primetime show Brothers & Sisters.
In a two-part 2010 episode, actress Kay Panabaker portrayed a teenage Kitty Walker in flashback sequences set in 1986.
Kitty supported his decision to join the army whereas Nora was completely against it, especially after Justin was deployed to Afghanistan.
Kitty quit her job in New York City as a radio host after she was offered the opportunity to be a part of the political show (Red, White and Blue) in Los Angeles, despite the fact that her then fiancé, Jonathan, didn't want her to.
Feeling betrayed and vulnerable, Kitty slept with cohost Warren Salter, further complicating things with Jonathan, who wanted to reconcile with her.
Kitty was therefore free to pursue an affair with Warren but he was hesitant, as he was already involved with his young assistant, Amber.
Warren finally asked Kitty out, and she accepted on the condition that he set things straight with Amber.
When Kitty's brother Justin was called to fight in Iraq, she asked one of her guests, Senator Robert McCallister, for his help, but he refused.
After another failed attempt to make him change his mind, Kitty apologized in front of her audience.
Most recently after the campaign helicopter that she and Robert were scheduled to fly on crashed, Kitty asked McCallister to marry her.
After Kitty and Robert marry, their main goal is to have another child; after in vitro fertilization fails, the couple decide to look at adoption.
When brother Kevin marries Scotty at the end of the season, it's Kitty who performs the ceremony.
Kitty, suspicious, questions Sarah about the letter and finds out that Nora wrote it, leading to a slight rift between them.
Later, Robert tells Kitty that he has heard rumours that someone in his administration has written a book about his failed presidential campaign.
In the episode "Bakersfield", Kitty is upset because Robert told her he was going to Washington but, in fact, went to Iraq to see the effects of the war.
While Robert is away, Kitty gets a call from the adoption agency with the news that a woman who is six months pregnant would like them to have her child.
While in Mexico visiting Tommy, he asks her if she loves him and at first she doesn't know but chases after him, only to find herself too late as his chopper has already taken off.
On the day of Justin and Rebecca's wedding Kitty learns that the chemotherapy has not worked and that in fact her cancer has spread.
In desperation Nora turns to Ryan and asks him to get tested and it is revealed that he is a match but doesn't want to donate his marrow as he blames the Walkers (in place of William) for his mother's suicide.
Just as everyone begins to lose hope, Ryan returns after sorting through what Nora said and donates his marrow to his half-sister.
Robert is severely injured, but persuades Justin, who is a med student, to help the others while he waits for an ambulance.
A talk with Nora makes Kitty realize Robert will never wake up and finally decides to shut off his life support.
When Kitty leaves for DC, she tells her family she is going for business meetings and breaks things off with Seth.