Shamsud-Din Jabbar, a 42-year-old Army veteran from Texas, posted videos hours before the Bourbon Street attack declaring support for ISIS and claiming he joined the group earlier this summer, according to the FBI. Shamsud-Din Jabbar, a 42-year-old Army veteran from Texas, posted videos hours before the Bourbon Street attack declaring support for ISIS and claiming he joined the group earlier this summer, according to the FBI.