Open this photo in gallery: Crime scene vehicle at the Woodward Avenue entrance to the Florida State University campus after a shooting, in Tallahassee, Fla., on April 17.Gary McCullough/The Canadian Press Amid the abandoned chemistry notes and other debris left behind after a deadly shooting at Florida State University are lingering questions about how the stepson of a beloved sheriff’s deputy tasked with school safety at a middle school became the accused gunman. Political science student Phoenix Ikner was a long-standing member of a sheriff’s office youth advisory council and was steeped in the family-like culture of the agency. When...