The dirtiest killer of the year was the man private investigator Ed Rivers had to save from the chair.Wally Tulman, Florida socialite, had been convicted of molesting and murdering a young girl.Tulman's lovely wife begged Rivers to take his case - to prove him innocent.Rivers wouldn't touch it with a ten-foot pole.Then somebody tapped him over the head, just to make sure.Ed Rivers got the message. Somebody didn't want him on the case.So he waded into it - with both fists flying.