There was nothing particularly suspicious about Maxwell's death. The music was up, the noose was tightening around him, and he was about to start eating shit for the consequences of his fraud.

The people he robbed in that fraud were regular Joes who were cheated out of their pensions, not some kind of shadow-government-global-conspiracy types who have the means to remote-program your toaster to kill you.

Him killing himself is not the most surprising way out of that situation.