One person was killed and another eight injured, including three children. A dog was also injured.
"From the very beginning of this investigation, we have met significant resistance that is uncommon from victims of crime wanting a resolution," a news release from police Chief Mark Denney said.
Willis told WCPO-TV that she lost her pregnancy after she was shot in the leg.
Denney said he wasn't trying to embarrass anyone by revealing the fake pregnancy, but wanted to illustrate the difficulties the police department has been facing.
"The Colerain Police Department will not comment further on any other misleading information, other than to say we wish our time had been spent on true leads that would help us remove these dangerous criminals from the streets," Denney said.