doomed
lost
pre-dead
goner
thanatognomonic
deathbound
Moros
written in the stars
suicidal
intestate
dead man walking
sure
way of all flesh
certain
with one's last breath
impendence
impendency
imminence
imminentness
imminency
forthcomingness
pop off
deader
linger
drop dead
deathism
in extremis
imminently
moribund
wisdom of Silenus
in articulo mortis
on one's deathbed
have one foot in the grave
die away
knocking on heaven's door
permadie
deathward
deathly
predecease
deathling
instadeath
have had it
dying
until Kingdom come
vitally challenged
probable
perimortem
mortal
bereave
dyingly