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
Got news for you, medics and cops ain’t trained for dealing with dead people. The cops I worked around as a medic were some of the most squeamish people at messy scenes.
Nor are you trained to climb up out of a drainage ditch and explain to a Mother that her 13 year old son is dead down there, pinned under a 4-wheeler, and not me or god can fix it. (A tee shirt I got) Or a family about why their son and brother is hanging 30 feet up in the air by a rope. (Another tee shirt I got)
I got a closet with maybe a tiny bit more of my share of tee shirts. But I sure as hell wasn’t trained for any of them.