Sorry, Bert, he wasn't killed in the White House! Don't think it would be logistically possible for the perps to do it there, because hundreds of people are working there on a weekday afternoon, including law enforcement, and not all of them could be compromised. Someone would have heard a gunshot blast (even if the weapon had a silencer) and/or saw blood or body being carried out.
The rubout occurred in a specific private DC office within easy walking distance from the WH to which the victim was lured.
The affair is secondary except for PR to make her look more attractive to the public. I would guess he knew too much.
BTTT.
May we all live long enough to find out the truth about what happened to Vince Foster.
Your work has been foundational in that quest.
God bless you and protect you for your courage in this matter.