After stints as a guard in the jails of Washington, D.C., and on the streets of post-Katrina New Orleans, Stephen Tyrone Johns had settled in to a job he liked at the U.S. Holocaust Memorial Museum, family members said. “It seemed to be kind of laid-back — it didn’t seem to be that dangerous,” Leroy Carter, the stepfather who helped raise Johns since he was 3, told CNN affiliate WUSA-TV in Washington
