Final answer:
This is an example of deterrence in the legal system, where the threat of punishment discourages individuals from committing crimes.
Step-by-step explanation:
This is an example of deterrence in the legal system. Deterrence is a principle that suggests that the threat of punishment can discourage people from committing crimes. In this case, the knowledge of the death penalty for murder serves as a deterrent, making the individual decide not to commit the crime.