Illegal's Re-Entry Raises a Question

News item:

Border Patrol agents working in southern Arizona arrested a Nicaraguan national previously convicted in Wisconsin for a homicide.

Federal authorities say 32-year-old Isaac Gutierrez-Blandon was among a group of suspected illegal immigrants captured Monday night near Why.

During processing, agents found that Gutierrez-Blandon was arrested by the Waupaca County, Wis., Sheriff's Department in July 2007, and was sentenced to six years in prison.

....was sentenced to six years for homicide in 2007, and is illegally re-entering in 2011?

Huh?