Oscar Pistorius has launched a formal appeal against his conviction for murdering his girlfriend Reeva Steenkamp.
The South African athlete killed Ms Steenkamp on Valentine's Day in 2013 after firing multiple times through a locked bathroom door.
He was convicted of murder last month after a previous manslaughter charge was overturned.
Pistorius has now applied to South Africa's Constitutional Court in a last-ditch attempt to avoid another prison sentence.
Pistorius, 29, could face a minimum 15-year jail term if his appeal fails.
He was released from prison - having served just one year of a five-year sentence - in October to live under house arrest at his uncle's property in Pretoria.