He kills Clove because he hears her say to Katniss that they killed Rue, and Thresh killed her for revenge. But he spares Katniss because she helped Rue in the arena.
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In the movie, by smashing her against the cornucopia thus breaking her skull.
In the book, by smashing a rock against her skull near the cornucopia.
Thresh killed Clove
Clove dies when Thresh breaks her skull with a rock at the "feast."
Clove dies at the feast. She's killed by Thresh, because of a rock.
No one knows. Katniss just hears about it when they see the dead tributes' faces projected in the sky. Yoyo_963: It says nothing about his death in the book BUT Suzanne Collins (the author) was working with the director and in the movie he dies by a mutt. In the book he was killed by Clove since later on on Clove recovered the package that Thresh stole
Peeta