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


Two people, in fact. First was a Hell’s Angels enforcer. Had lunch at a Chinese restaurant with him and a few other people from my former Kung Fu school. Apparently he was a former student and credibly accused of murdering a rival biker gang member, but the jury was hung and couldn’t convict.
Second was none other than Shrimp Boy, after he got released from prison for the murders he committed but before he got locked up again for the racketeering charges. Met in in Chinatown literally a few days before the feds closed in on him. Shared a cup of tea with him without knowing his identity and didn’t find out until someone present told me who he was days later.