By Debbie Emery - Breaking Celebrity News Reporter

The drama swirling around U.S. Gen. David Petraeus took a dark twist on Tuesday when the depth of menacing messages that his former mistress allegedly sent to her love rival promising that she would "make her go away" were revealed.

The New York Daily News is reporting that Paula Broadwell sent sinister e-mails to Florida socialite Jill Kelley boasting of her friends in high places that seemed like the rantings of someone "clearly unhinged," revealed a close friend of Kelley's.

"This wasn’t just a catfight. Any normal person who got e-mails like that would have immediately called the police," said the insider.

As Breaking Celebrity News previously reported, the FBI has been investigating e-mails that Broadwell sent to Kelley. The agency tracked the e-mails back to Broadwell, and then stumbled into thousands of messages sent between her and Petraeus. Some of those messages were sexually explicit, including one now famous message that referenced "sex under the desk."

The raunchy string of correspondence ultimately led to the married 60-year-old CIA director's downf