The Henry Fillings Murder

(Following up on this post...)
The story that I am having trouble ending is the death and murder of Henry Fillings. Fillings was a very successful, wealthy businessman, a household name to most. When he is found murdered in one of his private estates, it becomes headline news, intriguing enough for any media outlet. But when the main suspects that emerge turn out to be members of the same sideshow / circus troupe, the case holds a lot more mystery and intrigue.

The lead investigators are a unit of the F.B.I.'s High Priority Investigation Squad. (They affection ally call themselves CASE, for short.) Through interviews - and flashbacks - we learn a great deal about the members of this twisted little circus and how they all wind up having ties to this businessman.

Fillings himself was not exactly a saint, the chief sin against him being suspected - but never proven - ties to the mafia. In addition, Fillings son, Junior, has risen through the ranks based solely on his heritage, not on his talents. He was also a womanizer and a scoundrel, the type of man who went through assistants frequently. His main company is Epsilon Insurance, a well-respected megalith among American businesses. (Many of the circus troupe have ties to EI.)

The chief investigator for CASE always looks at the money trail first. Money, he says, can always lead back to the planners and the killers. The staff took this to heart and came up with a nice acronym, BPK: Banker, Planner, Killer. So for the Henry Fillings murder, the CASE squad needs to figure out their BPK's from a pool of twisted, misguided sideshow members and angry, corrupt businessmen, plus some angry mob men. To make things even more interesting, the head of the circus troupe is an old business associate of Fillings who was fired and slandered in the press.

Who is the Banker? Who is the Planner? Who killed Henry Fillings?
I. don't. know.

Yet.