Ok, I was looking absolutely everywhere for a list of all the deaths in Naruto. And I couldn't find any list. So i decided with the info from Leaf Ninja and Saiyan Island, and of course my own knowledge i am concocting a list of all the dead characters of Naruto.

Cause of Death:
Hidan performed a jutsu that caused Asuma any damage that Hidan received. Knowing he himself wouldn't die, Hidan stabbed himself in the stomach, fatally wounding Asuma, and eventually leading to his death.