Must the wife fast or pay expiation (diyah) after her husband's death from a heart attack, following her forcing him to take sexual enhancement pills she bought from the internet, given her fear of the matter being exposed?

The wife is not liable in this case, due to the possibility that the pills are not related to the husband's death. Even if we assume a connection, her insistence that he take them is not considered coercion, and she did not intend to deceive him. Rather, her intention was to strengthen his performance in bed, and she was ignorant of their harm, as many people use them. The husband could have refused to take them. Therefore, no blood money (diyyah) or expiation (kaffarah) is incumbent upon her, because the direct action (the husband's use of the pills) is stronger than the cause (the wife giving him the pills).