In Pakistan, tribal council members that were the ringleaders in burning a teenage girl to death have been arrested. Her relatives who agreed to the killing were also arrested.

I fear that Pakistan will execute them. In addition to the general wrongs of the death penalty, this risks enabling them to claim status as martyrs for the murder they did. I suggest instead punishing them in a way that will make them the object of public contempt. That way, others won't be tempted to follow their example.