It’s been a month since tragedy struck in Washington’s Wenatchee Valley, and the search for Travis Decker—the father accused of killing his three young daughters—continues to grip the region. The case began on May 30, when Decker failed to return 9-year-old Paityn, 8-year-old Evelyn, and 5-year-old Olivia to their mother’s home in Wenatchee after a scheduled visitation. Four days later, deputies discovered Decker’s abandoned white pickup truck on Icicle Road near Leavenworth. Just 50 yards...