Malcolm Bart, Alistair Becket's assistant and the actual killer. He impersonated Quimby to hire Browning, murdered Patricia to protect Becket's political ambitions, and confesses when confronted by the transformed Browning.
Their central conflict drives Browning's afterlife investigation.
Bart impersonates the person who hires Browning, and an intruder later fatally stabs Browning. Bart is revealed as the killer and confesses.
Bart serves Becket within his political operation.
Bart is identified as Becket's assistant, and Becket summons him while discussing access to the murder investigation.
Her investigation unknowingly threatens Bart's cover.
Jackie interviews Bart in Becket's office and later notices the calendar entry that helps connect the investigation to the hidden post-office box.
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