Sayyiduna Amr bin Hazm (may Allah be pleased with him) reports this statement of the Prophet (peace and blessings be upon him): "For deliberate killing, retaliation (qisas) is due, and for accidental killing, blood money is due."
Al-Tabarani recorded it. Its chain contains Imran bin Abi al-Fadl, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الديات / 10719