Why did Ikemefuna end up living with Okonkwo and his family?

The village elders told Okonkwo to take care of Ikemefuna until his fate was decided.

When Ikemefuna is sentenced to die, Okonkwo is afraid of being seen as weak. When Ikemefuna cries to him, Okonkwo takes care of Ikemefuna, (kills him).