Does the husband deserve a share of the blood money for his wife who was killed by her co-wife, knowing that he was the cause of the co-wife living next to her, and he tried to defame his deceased wife and her family?

The killing of the questioner's sister does not fall outside three categories:

1. Intentional Killing (Qatl al-Amd): Its prescribed punishment is Qisas (retribution), unless the guardians of the victim's blood (the heirs) or some of them pardon. If one of them pardons, Qisas is waived, and the Diyya (blood money) becomes obligatory for those who did not pardon, to be paid from the killer's wealth or from the Muslim treasury (Bayt al-Mal). The killer is also obligated to perform an expiation (Kaffarah) by freeing a slave; if unable, then by fasting for two consecutive months. 2. Accidental Killing (Qatl al-Khata'): In this case, Diyya and Kaffarah are obligatory. 3. Semi-Intentional Killing (Shibh al-Amd): This involves striking with an instrument that usually does not kill, with the intention of striking but not killing. There is no Qisas in this case, but a severe Diyya is obligatory upon the killer's Aqila (male relatives on the father's side), and Kaffarah is obligatory upon the killer.

In all cases where Diyya is established, the husband inherits from his wife's Diyya, as Diyya is inheritable and included in the estate.