The gunman at the federal building in Las Vegas Monday who killed a security guard and wounded a U.S. marshal was identified as a man who angry that his Social Security benefits had been reduced.

Law enforcement officials identified the shooter as Johnny Lee Wicks, age 66. After apparently opening fire once he entered the building, marshals and court security officers returned fire forcing Wicks outside the building. He died across the street.

The Las Vegas Review-Journal reported:

In 2008 Wicks filed a federal race discrimination complaint against a regional commissioner with the Social Security Division. Wicks' complaint stemmed from an encounter he had with the regional commissioner at the social security office after learning his monthly social security payment would be reduced.

The security officer killed in the gunbattle was 65-year-old Stan Cooper, a retired Las Vegas police officer who worked for a federal contractor providing security at the courthouse, according to a source.