Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

In case anyone doubts that that guy in back was Sims:

And, let's remember that this is a very finite universe. The guy is definitely a DPD detective. So, if he's not Sims, who is he? Here is the JFK investigators page of Denis Morrissette, and you're welcome to look through it for another candidate.

https://jfkinvestigators.wordpress.com/