Good question. We know that they were "Johnny's men" because Michael told Rocco to get them something to eat. But they weren't likely the killers because Rocco and the others would have recognized them
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.