We’ve all read the books, seen the movies or watched Columbo where someone plans and executes a “perfect” murder only to slip up on a minor detail, enabling the hero to solve the puzzle.
Most real-life murders are committed by someone known to the victim. Obviously then, the “safest” murder would be to do in a complete stranger, having no motive and leaving no evidence. This won’t count in this poll, since it’s actually too easy. (Leave a bomb in a bar, etc.)
In my tiny little mind, there are two earmarks to a “non-stranger” murder that could allow one to get away with it. The first is to leave no trace that a murder was committed. The second is to provide no evidence at the scene or otherwise and have an indisputable alibi.
I suggest the first is preferable, although harder to pull off.
So, who would you hypothetically off and how would you do it?