From a globally lauded athlete to convicted killer, Oscar Pistorius' fall from grace culminated Tuesday with a five-year sentence in the shooting death of his girlfriend. The sentence was imposed for the charge of culpable homicide, which in South Africa means a person was killed unintentionally, but unlawfully. Under South African law, he will have to serve at least one-sixth of his sentence -- 10 months -- before he can ask to be considered for parole.