Whitney Houston (AP file)
(NBC) -- The FBI has released its files on a trio of investigations the agency conducted on behalf of Whitney Houston.
The records released Monday show the agency conducted one investigation into an alleged extortion attempt in 1992, but agents and prosecutors determined no crime occurred.
VIEW | FBI Documents on Whitney Houston
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Documents included in the 128-page pertaining to the extortion attempt detail a time when someone Houston "[considered] to be a friend" threatened to go public with personal information about the singer.
In one letter the so-called friend demanded Houston pay $100,000 or "certain details" of her private life would be revealed to several publications. The missive goes on to say the if the amount is paid, the "friend" would be willing to sign a confidentiality agreement and promise not to reveal the information.
Agents also found no evidence of criminal threats to the singer in fan mail that was sent to the FBI for investigation in 1988 and 1999.
The file covers the height of the Grammy-winning singer's popularity but does not contain any new personal details.
Records on the FBI's extortion investigation in which Houston was interviewed at the New Jersey offices of her management company are heavily redacted.
Houston drowned in a hotel bathtub on the eve of the 2012 Grammy Awards.
(WNBC New York)