[TCats]

I think he was fingered by any number of very bitter, powerful enemies he made on Wall St. Whoever else gets outed in this thing is just so much, unlucky collateral damage.

[prairiebreeze]

According to the linked report, Spitzer foolishly made a request to his bank that his name be taken off some of his wire transfers. He was concerned they might expose what he was doing. His bank appropriately declined and then filed a Suspicious Activity Report opening the investigation.

LINK

Originally it was thought that Spitz was being blackmailed or his account somehow victimized. I doubt the bank or the IRS had any idea initially what this would lead to.

While I'm certain Spitz's enemies are pleased to witness his comeuppance, I don't think he was "fingered".