Who Killed theirself after losing a game to Odysseus?

Ajax. According to one version of the story, he loses the competition

for Achilles' armor and falls on his own sWord out of shame.

Another version says that after the competition, Ajax falls to the ground

in exhaustion and when he wakes up, he is under a spell from Athena.

In this state he slaughters a flock of sheep, believing that they

are the Greek leaders, including Odysseus. When he comes to his senses,

he kills himself out of shame.