Manhattan District Attorney's Office said. Ramos was released when the parents of the Bronx boys chose not to press charges against him, according to published reports. He left town and disappeared for six years -- until GraBois reviewed Etan's case. GraBois said he focused on Ramos as the prime suspect. GraBois said he learned in 1988 that Ramos had been arrested and convicted of child molestation and was serving time in a Pennsylvania prison. GraBois said he brought Ramos to New York for questioning and surprised him with the question: How many times did you have sex with Etan Patz ? Ramos told GraBois that he 'd taken a little boy to an apartment he had on the lower East Side on the same day that Etan went missing. He was 90 percent sure it was the same he 'd seen in the news that was missing, GraBois said. According to GraBois, Ramos claimed he released the boy and brought him to a subway station so the boy could go visit his aunt in Washington Heights. Etan did not have an aunt in Washington Heights, GraBois said. When questioned further, Ramos refused to say anything more and asked for a lawyer, according to GraBois. Ramos is serving a 10 - to 20-year prison sentence in Pennsylvania. He is scheduled to be released in November 2012, GraBois said. GraBois said he had Ramos transferred to a federal prison, and planted informants as his cell mates. He would n't go into