The Des Moines school board accepted Superintendent Ian Roberts' resignation Tuesday night in a unanimous vote.Driving the news: "It is a sad and troubling end for an individual who gave many people,

The U.S. Department of Justice is investigating Des Moines Public Schools for potential race-based employment discrimination.

U.S. Immigration and Customs Enforcement agents detained Roberts last week, saying the native of Guyana was living and working in the country illegally.