to die in the line of duty

to sacrifice one's life or commit suicide because of a romantic relationship or in the name of love, often involving a couple dying together

to die or be killed in a disaster, accident, or war; to be a victim of a catastrophe

to die for one's country

to die in the course of performing one's duty

(of servants etc) to be buried alive with the deceased; (of utensils etc) to be buried with the dead

to die for a just cause

to sacrifice one's life by loyalty (to one's prince, husband, etc.)

to die for one's religion

to be buried alive as a sacrifice (together with a husband or superior)