Kelley is just the latest in a long line of men with documented records of domestic abuse who went on killing sprees well after police became aware of their propensity for violence: Stephen Paddock (58 dead, Las Vegas, Oct. 1); James Hodgkinson (attack on members of Congress, Alexandria, Va., June 14); Robert Lewis Dear (the self-described “warriors for the babies,” killed three people at a Planned Parenthood in Colorado Springs, Nov. 27, 2015); and Omar Mateen (49 killed, Orlando, June, 2016).