Nagasaki Hitomi

was the father of Kagewaki Hitomi who was killed and possessed by Naraku, disguised as his son, after he lured Sango's family.

Manga vs. Anime
In the manga, he was beheaded by Naraku (who was disguised as his son). Afterwords a spider yōkai emerged from the head, and was then stabbed by Naraku. In the anime, he was stabbed in the back by Naraku (still disguised as his son).

Manga

 * Chapter 86
 * Chapter 87

Anime

 * Episode 24
 * Episode 25