Stéphane Peigneux' death sentence was never carried out. Belgium hasn't been carrying out death sentences for a while now and they are automatically commuted into a life-long custodial sentence. Stéphane Peigneux had managed to escape from a Belgian jail in 2012.
The jailbird has now been tracked down to Brazil. It is expected that he will soon be extradited to Belgium where he will serve the rest of his sentence in Leuven jail.