On the fourth anniversary of her husband’s murder, Kim Renninger got a tattoo on the instep of her left foot reading, “Keep moving one step forward.” It is a discreet, poignant reminder of her mission to make something out of the death of Sgt. Mark Renninger and three officers in the 2009 Lakewood police shootings — the worst act of violence ever committed against police in Washington. Her to-do list has included a change to the state Constitution, reform of interstate parole rules and keeping watch over the seven felony prosecutions stemming from the shooting. Now comes the last big...