Hadith.5278 - Musa ibn Bakr narrated from Al-Abd Al-Salih Imam Musa ibn Jafar Al-Kadhim (as) regarding a man who struck another man with a stick and did not lift it from him until he died.
Imam (as) said
"The killer should be handed over to the heirs of the murdered man, but he should not be left to be tortured for pleasure. Rather, retribution should be carried out upon him with the sword."