<P> The next morning, Martin meets Steven and reveals the truth: his father did not die in the crash but had died during surgery that Steven himself performed after the accident . Steven failed to save his father, and the boy blames the surgeon for the death . Martin explains that, to "balance" the act of destroying a family, Steven must kill one of the members of his own . If not, the Murphys will slowly die after four stages; paralysis is the first stage . Steven attempts to dismiss these claims, but later finds that Bob is refusing food: this is the second stage . Kim also loses the use of her legs and the will to eat . </P> <P> Kim receives a call from Martin at the hospital . During the conversation, she regains the use of her legs, only to lose mobility again when the connection is broken . This convinces Anna that Martin has power . She visits Martin to ask why she and her children must suffer for Steven's mistakes . Martin responds that "it's the only thing...that's close to justice". Anna, suspecting that her formerly alcoholic husband may have drunk on the day of the operation, speaks to Steven's anesthesiologist, Matthew, who reveals that Steven did in fact have a few drinks that morning . Anna performs a handjob on Matthew as payment for the information . At Anna's insistence, the children are transported to their home, where they are fed through a tube . Steven then kidnaps Martin, brutally beating him and demanding that he reverse the condition of the children . Martin is unaffected, warning Steven that time is running out . </P> <P> Martin's presence only exacerbates the tension in the household: Kim and Bob argue over who their father will choose; and Anna claims that killing one of the children is clearly the only option, as they can have another . Kim attempts to save herself by escaping and crawling through the neighborhood . Steven and Anna retrieve her . The next morning, Anna releases Martin as holding him captive was no use . Bob begins bleeding from the eyes - the final stage before death . Rather than choose, Steven binds Kim, Bob, and Anna to chairs, covers their heads, and pulls a woolen hat over his own face . He loads a rifle, spins in circles, and fires . The first two shots miss, but the third kills Bob . </P> <P> Some time later, the family visits the same diner where Steven met with Martin . Martin enters and stares at them; he and the family briefly lock eyes and the Murphys leave as Martin gazes after them . As the family leaves the diner, Kim looks over her shoulder at Martin and there is just a hint of smile on her lips and in her eyes . </P>

Who dies in killing of a sacred deer