Demps went unselected in the 2006 NFL Draft, however he was signed by the Detroit Lions as an undrafted free agent on May 8, 2006, after participating in the rookie mini-camp as a tryout player.
Demps wasn't chosen in the 2006 NFL Draft, but he eventually joined the Detroit Lions as an uncontracted rookie on May 8, 2006, following his appearance at their preseason training sessions as a test candidate.