CINCINNATI An armed suspect who killed a Cincinnati police officer and then was shot to death by police wanted to ambush and kill as many officers as possible, a prosecutor said Wednesday.Hamilton County prosecutor Joe Deters said there will be no charges in the case. Deters said 21-year-old Trepierre Hummons, had he survived, would have been facing the death penalty for shooting Officer Sonny Kim."I believe the motivation was, his goal was, to lure and kill as many police officers as he could," Deters said.He said Tom Sandmann, the officer who killed Hummons, "deserves a medal" for saving lives. "There could have been a lot more dead police officers," Deters said.