 Johnson—considered by many to be an expert on this case—had become interested in the Grimes sisters' case in 2010, when he had been researching a book he had been writing about the city's history.Having extensively researched the case, Johnson has stated his conviction that the case is still a solvable one, but only with public assistance, and that he believes that the perpetrator of this crime had been a 23-year-old self-confessed child killer named Charles LeRoy Melquist, who had been considered a suspect in the sisters' abduction and murder in 1957.Melquist had been convicted of the September 1958 murder of a 15-year-old girl named Bonnie Leigh Scott, whom he had known prior to her murder, and whose decapitated body had been found two months after her disappearance less than 10 miles from where the Grimes sisters' bodies had been discovered.