The execution of qisas (retaliation in kind) by the awliya (close friends of Allah) of the murdered person instead of the one in authority

Question:
Honorable Shaykh, is it permissible for the awliya of the murdered person to execute qisas instead of the one in authority after the ruling has been issued?

Answer:
No hudud (fixed Qur'anic punishments) or qisas is carried out except in the presence of the one in authority or his deputy, in order to guarantee the prevention of harm and transgression, and also to ensure security so that no aggression or fitnah (trial, discord or temptation) occurs from the awliya of the perpetrator. Therefore, qisas must be carried out in the presence of the one in authority or his deputy whom he appoints for that purpose, in order to prevent harm and transgression.