Can a karate kick be fatal?

Answer 1

If you hit someone hard enough.

If you kick someone in the lower-mid back with enough force, that can be fatal, as would be to kick someone in the back of the neck. Any blow, whether a kick or a punch, could be fatal. A heavy kick in the chest can literally stop the heart. And strong kick in the area of the spine or neck can snap bones and severe the spinal cord. They can cause blood clots which can go to the heart and kill a person. They can cause heavy bruising, which can lead to many different problems, some of which can be fatal.