NATCHEZ (AP) — A federal judge has rescheduled the trial of an inmate accused of participating in a deadly prison riot last year in Mississippi.

One guard was killed and 20 people were injured in the May 20 riot at the privately run Adams County Correctional Facility in Natchez, which houses illegal immigrants convicted of crimes in the U.S.

Marco Perez-Serrano has been identified as the first person to attack correction officer Catlin Carithers, who died.

Court records say Perez-Serrano, also known as Jesus Fernando Ochoa, hit him with a food tray.

Attorney Joseph M. Hollomon asked for a delay of the June 3 trial. It is now scheduled for Aug. 19.

It took hours for authorities to control the riot, which grew to involve hundreds of inmates.