South Africa’s highest court has dismissed Oscar Pistorius’ appeal of his murder conviction for “lack of products of success,” as announced by The Associated Press on Thursday.

BREAKING #OscarPistorius Constitutional Court has dismissed Pistorius application for leave to appeal. BB

— Barry Bateman (@barrybateman) March 3, 2016

The ruling by the Constitutional Court allows the judge to sentence the former track runner for murder at a hearing on April 18. The conviction carries with it a minimum of 15-year sentence in South Africa. 

#OscarPistorius here it is - ConCourt order dismissing application for leave to appeal. BB pic.twitter.com/QAShw5QmtV

— Barry Bateman (@barrybateman) March 3, 2016

Pistorius appealed to the Constitutional Court by claiming that another court made an error when it overturned a manslaughter conviction and declared him guilty of murder. The Olympic athlete was put on trial in 2013 for the murder of his girlfriend Reeva Steenkamp after he shot her through a bathroom door. He claims that he mistakenly thought she was a home invader.

In December 2015, Pistorius was convicted of murder in a shocking court reversal by the Supreme Court of Appeal. He had previously been charged with the lesser charge of culpable homicide for Steenkamp’s death, as he maintained that he mistook her for an intruder. He was released on house arrest on Oct. 19 of 2015 after serving one year of his original five-year sentence.

Pistorius became famous for his athletic accomplishments on the track when he made history at the 2012 London Olympics by becoming the first double leg amputee to compete at the Games. He also won six Paralympic gold medals during his career as 400m sprinter.