CHICAGO (CBS) -- Major developments surfaced Thursday into the 40-year-old investigation into the Tylenol murders in the greater Chicago area. CBS 2 Chicago learned that investigators travelled to the Boston area this week to re-interview the man considered a suspect in the seven deaths. James Lewis was never charged with the murders, but he was convicted of trying to extort $1 million from Johnson & Johnson in the days after the cyanide-laced pills showed up on store shelves. The CBS 2 Investigators began re-examining the case back in April; reporter Brad Edwards travelled to Massachusetts last month to try to...