CHICAGO (AP) – Opening arguments are set to begin Monday in the trial for two men accused in the 2009 shooting death of Chicago police officer Alejandro Valadez.

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Cook County State’s Attorney Anita Alvarez will serve as lead prosecutor.

Valadez was shot to death as he investigated a shots fired call on the city’s South Side in June 2009.

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Eric Walker and Christopher Harris are being held without bond in Cook County Jail.

Another person has already been found guilty in connection with Valadez’ death. Shawn Gaston is serving a 125-year prison sentence.

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Prosecutors contended Gaston was out for revenge after he and other alleged gang members were shot at by rivals