23 year-old Shane Canavan and his half-brother, Joshua Langley, aged 29, were both arrested after police were called to a fight in New Addington in September last year.
They were convicted in July of murder and wounding with intent after police recovered a crowbar, monkey wrench, knife and balaclava from the scene.
20 year-old Bradley Hutchins died as a result of wounds he suffered.
His 19 year-old brother Calum was seriously injured.
