This item or feature has been removed from the game or replaced by something else.
This section is likely to contain major spoilers pertaining to the story of Project Zomboid.
Concept art for Kate Smith
Bob and Kate's house|
||“I'm sorry I fucked up hon. I screwed everything. Screwed us...”
|— Kate Smith
In 2013, Kate and 'Til Death Us Do Part were removed from the game, along with NPC survivors, with the release of version RC 2.9, due to NPCs being far too buggy. The Indie Stone did not abandon the story and have stated they still have big plans for NPCs and the story of Bob and Kate. 
Kate is your wife at the start of the game as you play as Bob Smith in 'Til Death Us Do Part. She has a broken leg and cannot move, therefore, Bob has to take care of her in the tutorial. It is obvious that she loves Bob, as she tells him that he is the sole reason that she is alive, which is actually quite true. She is quite intelligent, knowing that it is dangerous to scavenge in the night, and stops Bob from doing so.
Before the story, Bob and Kate were nomadically wandering the quarantined Knox Country. However, they got attacked by adversaries, but survived the attack. Unfortunately, Kate broke her leg and it got severely cut, and she is unable to move. Bob and Kate quickly moved into the closest house, and because she is injured, Bob put her on the bed of the house, and then tended her injuries. After he tends her wounds, he fortifies the house and finds supplies to make sure that Kate is safe.
After being bandaged, if she survives long enough, her status effect of 'bleeding badly' changes to simply 'bleeding' and then disappears as her wound heals. However, she retains the status 'broken leg' for much longer (possibly indefinitely?). Bob can further tend to her wounds by making an improvised tourniquet with his belt, successfully stemming the bleed.
She can die during the tutorial, whether it is by being smothered with a pillow, burning to death after the house is set on fire, getting shot by a raider while listening to the radio, or Bob accidentally swinging his weapon at her. Once she dies, the music will change to a much more depressing one. If she dies by the pillow, Bob will get a picture of a much healthier Kate.
If Bob forgets to turn off the oven, she can be carried to safety to another safe house.