Not just uncaught murderers, there are a lot of people who have killed without legally being considered murderers.
People who killed people in accidents such as driving accidents or hunting accidents
People who killed in self defense
Soldiers who killed enemy soldiers
Executioners
Police officers who have killed on duty
Doctors and nurses who have made mistakes that accidentally killed patients


You want to get philosophical? Every mother and father are both directly responsible for the death of their children - even when that death is natural causes by old age, it wouldn’t have happened if they weren’t born.