Who is Jimmy Smithe from Rules of Prey and what is their importance?

Jimmy Smithe is a country welfare worker. He fits some parts of the profile the police have developed. Smithe lives near Lake Harriet, near where the Lewis woman had her office. He is a suspect in the serial killings, and he is quietly being investigated and observed by the police. Jimmy is released after his arrest because his alibi checked out, and Lucas received a call from the maddog.