NEW : Reward offered in officer 's death . Slain officer identified as Michael Flisk . A Chicago evidence technician is fatally shot along with another man , police say . The suspect was later arrested and charged with murder.
NEW : Reward offered in officer 's death . Slain officer identified as Michael Flisk . A Chicago evidence technician is fatally shot along with another man , police say . A gunman is being sought ; no details on the circumstances of the shooting have been released .