MIAMI -- A South Florida woman was being held on $250,000 bond Wednesday, days after police in Miami arrester her for allegedly using multiple identities and phony stories to rob at least two elderly men of nearly $1 million.

Police said Sabrina Williams alternately called herself Lila Feldman or Sofie Marlowe, and that she targeted elderly men who had large savings accounts and little family, in what authorities called a "classic gypsy scam." Williams reportedly befriended two victims, ages 83 and 93, then told them she was suffering from a life-threatening illness and that she needed money for surgery.

Authorities said Williams listed her occupation as "psychic" and called herself a gypsy when she was arrested May 28.

Williams reportedly met the 93-year-old widower after approaching him at a Publix supermarket in Surfside.

"She said, 'I thought you looked like a friend of my dad's, and one thing leads to another,'" Fernandez-Rundle said. "He wants a friend. He is looking for friendship, and she knows that. So she is an opportunist."

The unidentified victim reportedly gave Williams $725,000, which she said was for a transplant operation, and which she said she would both repay, and secure with real estate she owned in New York. Police said she even introduced the men to a supposed nurse to "validate" her story. Authorities said the "nurse" was an accomplice in the scheme.

The 83-year-old victim, a former nuclear engineer from Miami Shores, gave Williams $225,000 after pleaded for money using a similar story, authorities said. The two reportedly met after Williams knocked on the victim's door, looking for information on local real estate.

Williams, 43, from North Miami Beach, was being held without bond at the Women's Dentention Center in Miami on two counts of grand theft and two counts of organized fraud. She had been free on bond after a January arrest on grand theft charges, after authorities said she stole a half-dozen pairs of shoes from the Bal Harbor Neiman Marcus store and tried to return them for cash at the store in Coral Gables.

The state attorney's office said Williams, who was born in Boston, was part of a ring of thieves who target elderly victims, and they said there could be more victims, in Broward as well as Miami-Dade County.

"They have done their research," State Attorney Katherine Fernandez-Rundle said. "They target these folks and prey on their emotions. (Williams) said, 'I need a liver transplant and I will die if I don't get one, and she took two of the victims for a substantial amount of money."

Authorities were asking anyone who believes they may have been scammed by Williams to contact the Miami-Dade state attorney.

They also praised the victims for coming forward, saying that often, elderly con victims are too afraid or embarrassed to notify police.

Investigators also said they are tracking the cash and that the chances are fairly good that the victims could get some of their money back.