Law enforcement officials have been on edge since Jan. 31, when Mark Hasse, an assistant district attorney in Kaufman County, Tex., was gunned down outside a courthouse. In the weeks since, his boss, a Colorado prison director, a West Virginia sheriff and a Mississippi detective have also been fatally shot.
Eric Smith -- Mississippi Authorities say a murder suspect killed Detective Eric Smith, center, inside the Jackson, Miss., police headquarters April 4. Both the suspect and detective are dead. Smith, 40, who had been with the department since 1995, was gunned down inside an interview room as he was questioning the 23-year-old man about a fatal stabbing, authorities say. Smith leaves a wife (also a police officer) and two sons. Jackson, Miss., Police via AP Buy Photo