It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever is killed in a blind (senseless) fight, or (unintentionally) by the throwing of a stone or a stick, his blood money is the heavy (mughallazah) kind, upon the clan of the killer. Whoever kills with his own hand (deliberately), retaliation (qisas) is taken from his hand. And whoever stands in the way of it (the retaliation), upon him is the curse of Allah, the angels and all the people; neither a voluntary deed nor an obligatory one will be accepted from him."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10971