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
I’ve been in the army and I met guys there who took part in the Karfreitagsgefecht. They may or may not have killed some poor peasant with an AK but they for certain lost an important part of themselves.