2018 Missouri Laws 565.020 – First degree murder, penalty — person under eighteen years of age, penalty.

2009 Missouri Laws 565.020 – First degree murder, penalty–person under sixteen years of age not to receive death penalty

2014 Missouri Laws 565.020 – First degree murder, penalty–person under sixteen years of age not to receive death penalty

2013 Missouri Laws 565.020 – First degree murder, penalty–person under sixteen years of age not to receive death penalty

2015 Missouri Laws 565.020 – First degree murder, penalty–person under sixteen years of age not to receive death penalty

2016 Missouri Laws 565.020 – First degree murder, penalty–person under eighteen years of age, penalty