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The gunman, identified by law enforcement sources as Johnny Lee Wicks, died from gunshot wounds after fleeing across the street as court officers returned fire.

Stanley W. Cooper, a 72-year-old court security officer, was killed in the minutes-long gun battle. Cooper, a policeman for more than a quarter-century, had been a federal security officer since 1994, said Jeff Carter, a U.S. Marshals Service spokesman.

A wounded deputy U.S. marshal, 48, was in stable condition at a hospital. His name was not released.

Law enforcement sources said Wicks’ failed federal lawsuit — an erratic document riddled with spelling and grammatical errors — was a likely motive.

In 2008, Wicks, who had moved from California to a local retirement home, filed a complaint against a regional Social Security Administration commissioner, contending that his monthly benefits had been reduced by $317 because he was black.

“It’s all about race,” he wrote in the complaint, although he cited no evidence. “I am no fool.”

A lawyer for the Social Security Administration responded in court documents that Wicks’ payments had been cut because, as a Nevada resident, he was no longer entitled to a supplement he had received while living in California.

The lawyer also said that Wicks had not taken advantage of Social Security’ssystem of appeals.

A judge threw out Wicks’ case in September.

Authorities said Wicks’ apartment caught fire about 5 a.m. Monday. Then, about 8 a.m., he entered the building where his lawsuit had been heard, the Lloyd D. George Federal Courthouse, just south of the aging casinos on downtown’s Fremont Street.

Wicks, who had a stroke several years ago and said in his lawsuit that he sometimes struggled to walk, was sheathed in black.

The retiree pulled a shotgun from his jacket and opened fire in the entryway, a few steps from two metal detectors, said Joseph Dickey, an FBI special agent.