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
Our legislators and judges are enormous chicken shits for not addressing this issue better. In a way, I would call them demented torture masters for their lack of clear and humane definition of when assisted suicide and mercy killing are legally permissible. Not required, but when all competent parties are in agreement? Keeping people with no quality of life and no hope of recovery alive with technology can’t be called anything but torture, in my opinion.