Updated Sept. 23: Revised to include details about the assault.

An Air Force veteran who died after being sucker punched on Sixth Street in Austin was killed over a slice of pizza, the Austin American-Statesman reported.

Marques Johnson and his wife. (Austin Police Department)

Officers were flagged down about 2 a.m. last Sunday to the 200 block of East Sixth Street, near Brazos Street. They found Marques Johnson, 33, lying unconscious in the street with a crowd forming around him.

Johnson was taken to Dell Seton Medical Center, where he died Monday.

Police charged Nathan Raynard Marshall, 28, with manslaughter Thursday. He was being held in the Travis County Jail on an unrelated assault on a public servant charge when he was charged. Bail has been set at $150,000.

Nathan Marshall

Police say that Marshall admitted to the fatal punch, according to court documents obtained by the Statesman.

"Marshall stated that (Johnson) smashed pizza out of a white male's hands," the detectives wrote in an affidavit obtained by the newspaper. "Marshall stated (Johnson) came back and so he sucker punched (Johnson) ... one time and (Johnson) fell down."

A witness told officers that Johnson "bumped into someone" and then was punched by Marshall, according to the affidavit, the newspaper reported.

Another witness told detectives that someone threw a piece of pizza at Johnson, and when he turned around and asked who did it, he was punched and fell to the ground.

Marshall's criminal record includes five arrests related to violent behavior, the Statesman reported.

Johnson served in the Air Force for eight years. He and his wife had been celebrating her sister's birthday the night he was punched, according to a Youcaring.com fundraising page that has raised more than $13,000.

The couple, who have a young son, had been married 18 months. Johnson was a registered organ donor, and doctors told his family he saved eight lives in his death.