die
decease
perish
exit
pass away
expire
pass
kick the bucket
cash in one's chips
buy the farm
conk
give-up the ghost
drop dead
pop off
choke
croak
snuff it
pass from physical life and lose all bodily attributes and functions necessary to sustain life
She died from cancer
The children perished in the fire
The patient went peacefully
The old guy kicked the bucket at the age of 102