William J. Sharkey was a pickpocket, a con man, a politician, and a murderer, though whether or not that murder was an accident became the question at the center of a case that gripped New York for months. And then, he vanished. Sort of.
Research:

Hercules Posey & the President’s House
45:15

SYMHC Classics: Pueblo Revolt
24:21

Behind the Scenes Minis: Coffee, 'Pirats' and Sea Robbers
30:36