completely told. in victorian times, they didn't have knicks like d.n.a. it will be a mammoth task. megyn: any next guest plays a major role in solving the case saying that there is evidence that jack the ripper may have killed in the united states as well. trevor marriott, murder squad detective, retired, and author. thanks for joining us. those are two stunning headlines, number one, you think you know who it is and, number two, that he killed in the united states. >> well, the person that becomes the prime us is expect a former merchant seaman who went under the name of kyle fagenborn, and that was not his real name. megyn: what was his motive?