For murder rate in states without the law, if we divide the states into regions, below is what we get:

For the South, we see kind of a bump in the early 2000s, and then an increase beyong 2015. Murder Rate for States without the Law - South

Maybe the Northeast also has kind of an increase in the early 2000s. Murder Rate for States without the Law - Northeast

Maybe it is the same trend. Murder Rate for States without the Law - West

Increase in the early 2000s. Murder Rate for States without the Law - Midwest