For the first time in a decade, there is movement on the Tylenol murders. Investigators traveled to meet with their top suspect in hopes of shoring up the case against him. The Tribune talked to him, too. They outline what evidence investigators say they have against Lewis –– and what they don’t. Is the case bulletproof enough for prosecutors and a jury?For exclusive details about the Tylenol Murders and a transcript of this episode, visit www.chicagotribune.com/tylenolmurders.