What happened to the boy from district one that killed Rue?

The boy from District 1 who killed Rue in "The Hunger Games" is named Cato. After Rue's death, Cato becomes a significant antagonist in the story. Ultimately, during the climax of the Games, he faces off against Katniss and Peeta, leading to a tense confrontation that results in his own death. Cato's demise underscores the brutal nature of the Games and the moral complexities faced by the tributes.