What is the ruling regarding a woman who died due to an old sorcery that prevented her from eating, drinking, and speaking, until she suffered from fever? Is she considered a martyr, and is it obligatory to investigate who cast the sorcery on her?

A person afflicted by magic is not a martyr. Rather, it is one who is killed unjustly who is considered a martyr, as mentioned by Abu Omar ibn Abd al-Barr. It is not advisable to delve into the matter after death due to the difficulty of verification. Instead, patience, supplication, and seeking forgiveness are recommended.