There is no death touch. This is based on a junk idea of a pressure point that does not exist.
Some *strikes* can be deadly though... Strikes to the head or neck can cause seriously damage and death, but this is EXTREMELY rare and usually requires the victim to have a previous condition such as osteoporosis (which causes weak bone structure), and as such are accident, not intentional.
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No the technique is not real. However, there are many strikes and ways of killing people in the Martial Arts that are very real.