A U.S. Marine was arrested Tuesday at his base in an Arizona city near the Mexican border, some 1,100 miles from where he allegedly shot and killed a 20-year-old college student who'd just rung in the new year. Eric Jamal Johnson was taken into custody in Yuma "for killing Sara Mutschlechner," Denton, Texas, police spokesman Shane Kizer told CNN. The U.S. Marine Corps said in a news release that Johnson was arrested in connection with the Denton shooting around 6:30 a.m. (8:30 a.m. ET) Tuesday at the Marine air station in Yuma where he's based. Johnson, a corporal, belongs to...