OCALA, Fla. -

A Florida woman is facing a potential life prison sentence after admitting to robbing three banks in which she threatened tellers with a gun.

The FBI says 53-year-old Renita Mount Rayner of St. Petersburg pleaded guilty this week in Ocala federal court to bank robbery and firearms charges. A sentencing date has not been set.

Investigators say a friend of Rayner's recognized her from photos made public of an August robbery in St. Petersburg. The FBI says Rayner also robbed banks in Dunedin and Ocala last fall, usually handing tellers a note claiming she had a gun and would use it.

In one robbery, the FBI says Rayner wore a wig that was recovered and provided DNA. In another, a fingerprint of hers was found on a note left behind.