Officer Valadez was killed last June as he was responding to calls of shots fired on Chicago's South Side.
Shawn Gaston, Kevin Walker and Christopher Harris are all facing murder charges and are currently in police custody.
Officer Valadez was killed last June as he was responding to calls of shots fired on Chicago's South Side.
Shawn Gaston, Kevin Walker and Christopher Harris are all facing murder charges and are currently in police custody.