من لا يحضره الفقيه, volume 4, page 106

Al-Hasan ibn Mahbub narrated from Khidr Al-Sayrafi from Burayd Al-Ijli, who said: Abu Jafar Imam Muhammad ibn Ali Al-Baqir (a.s) was asked about a man who intentionally killed another man, but the legal punishment (hadd) was not carried out on him, and the testimony against him was not confirmed until he lost his sanity and became mentally unstable. Later, another group of people testified after his insanity that he had committed the murder. Imam (a.s) said: "If they testified that he killed the man at the time of the murder while he was sound in mind and had no mental illness, then he should be executed. But if they did not testify to that, and he had known wealth, the blood money (diyyah) should be paid to the heirs of the murdered person from the killer's wealth. If he left no wealth, the blood money should be paid from the public treasury (Bayt Al-Mal) of the Muslims, for the blood of a Muslim must not be wasted."

Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.

Hadith.5199 - Sulayman ibn Khalid asked Abu Abdullah (as) about a man who hired a wet nurse and entrusted his child to her. While the child was with her, the wet nurse went and hired another woman to care for the child. This second wet nurse then disappeared with the child, and it became unknown what happened to the child, and the original wet nurse could not be held accountable. Imam (as) said: "The full blood money (diyyah) must be paid."

Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.

Hadith.5200 - Al-Hasan ibn Mahbub narrated from Al-Hasan ibn Hayy, who said: I asked Abu Abdullah (as) about a man who was found murdered. Two men came to guardian of the victim; one of them said: "I killed him intentionally," and other said: "I killed him by mistake." Imam (as) said: "If the guardian accepts the statement of the one who confessed to intentional killing, then he has no claim against the one who confessed to accidental killing. And if he accepts the statement of the one who confessed to accidental killing, then he has no claim against the one who confessed to intentional killing."

Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.