What is the origin of the idiom "get away with murder" and when to use it?

The origin of the idiom "get away with murder" can be traced back to the early 19th century. The expression is believed to have emerged from the legal system and the concept that murder is one of the most serious crimes one can commit. It is often employed in discussions about justice, law enforcement, and ethics to criticize situations where individuals or entities seem to evade punishment or face minimal repercussions despite engaging in significant wrongdoing.