And, of course, I am using the assumption that the person parked at the CPS building is the killer not just an unaccounted for witness. The killer could very well have parked at Freedom Bridge. (Although, if he planned to commit the crime, i.e., stalking for prey, I think the CPS building would fit his needs better.)
My mistake is that I frequently forget that LE has said they want to talk to this person and have not labeled them a suspect like they did with the guy on the bridge. For all I know this person may have been seen taking numerous photos, maybe even seen with a camera model (Canon, Nikon, etc.), and LE wants to know what they have. (For the record that is a scenario that I created for an example....I'm not saying someone was actually there taking photos.
) This person may not be a suspect, but someone on a day trip from Chicago IL, Louisville KY or St. Louis MO and they have not followed this case. After all, I believe at the first CrimeCon the family attended didn't they state there were attendees who were not familiar with this case?