How to Kill Zombie Process?

Use Command Check Process:
#top
or
#ps aux
or
#ps -el
or
#ps aux | awk '{ print $8 " " $2 }' | grep -w Z
or
#ps -elf | grep Z
or
#ps -ef | grep firefox

Output:
Z 6502
Z 8320
Z 6985

Use Command kill zombie Process:
# kill -9 6985