McMahon's Executive Assistant Jonathan Coachman is the guilty party.
If a crime occurs then there is, ipso facto, a guilty party.
If a crime occurs, then according to the facts, there will be a guilty party.
It has to be proved that they are the guilty party.
They felt sure that he was the guilty party, but they had no evidence to go upon.
Whoever is the guilty party – the person who said it or the accuser – [should] get their due punishment
As the publishing industry finally lumbers into action, authors are attempting, like real-life Hercule Poirots, to assemble the suspects in the library and identify the guilty party.
