Jefferson says he reported the crime to the FBI which launched an investigation -- an investigation that included RJ getting Kritza on the phone and secretly recording a conversation.

During the phone call, RJ says Kritza "confesses to wrong-doing" ...

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NBA star Richard Jefferson says he was taken for $2 MILLION ...

and played a key role in a covert FBI operation to catch the (alleged) bad guy and recover his cash.

According to 82games.com, Jefferson held opposing shooting guards to a PER of 12.0 and kept opposing small forwards to a PER of 16.3. Jefferson can be considered as an invaluable piece for Cleveland Cavaliers.

Let’s wait until Jefferson confirms about his retirement.

But Jefferson waited much longer, his friends told The Post. “He gave his best friend the Black Amex for the night.” Jefferson’s guests made good use of the credit card to party on their pal’s dime.

Nichols did check in to the hotel on what was to have been her wedding day, and was upgraded to a suite on the 45th floor with a king-sized bed and a Central Park view, according to a source at the Mandarin.

and the incriminating recording is now with the feds.

BTW -- the bank ended up suing Jefferson for part of the money ...

Jefferson — who was traded in June to the San Antonio Spurs — dumped Nichols just before the weekend, according to sources.

She immediately called her family and friends to say the ceremony was off. He never showed up at the hotel, but “all his boys were there,” the friend said.

It's all part of new legal docs obtained by TMZ Sports ...