Second Guilty Verdict In Cop-Killer Trial

CHICAGO (CBS) -- A jury on Wednesday found a second man guilty in the murder of a Chicago Police officer in 2009.

Kevin Walker was convicted of first degree murder and attempted first degree murder, the Cook County State's Attorney's Office said.

Chicago Police Officer Alejandro "Alex" Valadez was shot and killed in the line of duty while responding to a call of shots fired in the Englewood community in 2009.

Another defendant in this case, Shawn Gaston, was previously convicted of the officer's murder in 2011 and is serving a 125-year prison sentence.

Another defendant in the case, Christopher Harris, was also convicted.

Cook County State's Attorney Anita Alvarez served as lead prosecutor.

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

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