AUBURN – Two women face trial next month and a third has pleaded guilty in the foiled robbery of a Dunkin’ Donuts last year in which a worker chased down one of the suspects after fending her off with a coffee pot.

Two 19-year-olds, Chassidy L. Black of Gardiner and Savannah L. Stockman of 46 Riverside Drive in Auburn, are scheduled for an April trial in Androscoggin County Superior Court on robbery charges. The felony carries a maximum sentence of 30 years in prison.

Elizabeth Ferguson, 20, of Lewiston agreed to plead guilty to robbery and violation of condition of release.

She is expected to be sentenced once she has completed adult drug court, in which she’s enrolled. She agreed to a sentence of six years, all suspended, plus four years of probation on the robbery count.

Conditions of her probation would include:

• no use or possession of alcohol and/or drugs or dangerous weapons;

• random search and testing for use or possession of alcohol and/or drugs or dangerous weapons;

• substance abuse counseling to satisfaction of probation; and

• 50 hours of public service.

If she fails to complete drug court, Ferguson would serve 2 years of her six-year sentence, court documents say.

A worker who was washing dishes at Dunkin’ Donuts on Riverside Drive in Auburn told police he came out front during the August robbery.

Chris Hitchcock, 21, said he came to the aid of a co-worker at the counter. Hitchcock said he told two women in the lobby they weren’t getting any money and ordered them to leave, according to a police affidavit filed in court.

One of the women had brandished a large knife, but Hitchcock countered with a coffee pot, according to the affidavit.

As the women fled, Hitchcock chased the knife-wielding suspect to nearby South Bridge, where he tackled her. He grabbed her red-hooded sweatshirt but she managed to escape before police arrived. She also left behind a piece of cloth, which she had held over her face during the attempted robbery to hide her identity, the affidavit said.

Hitchcock gave police a detailed description of the woman. She had dropped the knife at the shop and police noticed it was missing its handle. Another witness described a unique earring worn by the second woman in the attempted holdup.

Two days after the incident, two Auburn detectives were driving through downtown Lewiston when one of them noticed an earring being worn by one of two women on the sidewalk. The two women matched descriptions given by witnesses of the attempted robbery.

During an interview, police learned the women lived just over South Bridge in Lewiston. One of the officers, Detective Chad Syphers, later went to their apartment and found Ferguson there. He noticed that a pillowcase lying on the living room floor was missing a large piece that matched the color and design of the piece of cloth left at the crime scene.

He also noticed a knife handle sitting on a television near the pillow case, the affidavit said. The handle was “consistent” with the blade left at the crime scene, he wrote.

Syphers talked to Ferguson, who denied participation in the robbery, but said the knife handle belonged to her, so the blade likely would have her DNA on it. She said the blade must have been stolen.

Hitchcock later picked Ferguson’s photo out of a lineup as the would-be robber with the knife. She was arrested on a robbery charge.

Black told police she overheard Ferguson and Stockman planning a robbery at the shop. They asked Black, who had worked there, about its operations. She said a policy states workers should comply with robbers’ demands if a weapon is displayed.

She said the three women went to the shop. Black believed it was a joke. But as they approached, Black realized Ferguson was serious about the robbery. Black said she didn’t go into the shop, according to the affidavit.