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A St. Mary’s teenager pleaded guilty Friday to first-degree assault in connection with a knife attack on two people last winter at a grocery in Lexington Park.

Keana Marie Biscoe, 16, remained free on $20,000 bond after Friday’s plea hearing, to await sentencing on the felony charge. Her plea agreement calls for her to receive an active sentence of no more than 18 months in jail.

Biscoe said after Friday’s court proceeding that she repeatedly was threatened and assaulted during the Jan. 10 incident at the Food Lion business in the St. Mary’s Square shopping center.

Biscoe was arrested and charged as an adult on original district court papers alleging that Amanda Marie Parks of Lexington Park suffered four stab wounds in her stomach, two in her head and two in her back. Parks also suffered an eye injury when she was struck with a candle, according to court papers, and Michael Scott Burke, an employee at the grocery, was stabbed in the buttocks as he tried to help the injured woman.

Parks was flown to a hospital for treatment of her injuries, St. Mary’s sheriff’s deputies reported after the incident, and Burke was taken by ambulance to a hospital to be treated for his injuries.

Two younger girls, age 13 and 15, who were accompanying Biscoe also were arrested through the investigation, and charges against them were resolved in February in juvenile court.

A prosecutor said before Friday’s plea hearing that one of the younger girls was conversing with a boyfriend of Parks, before Parks said that it was time for her and the boyfriend to leave the store. Parks told police that she was there with her boyfriend when a female later identified as Biscoe approached and yelled, “You got a ------- problem?” before commencing the attack, with the two younger suspects jumping in to assist, according to the court papers filed by sheriff’s deputy Scott Ruest.

Biscoe pleaded guilty Friday to committing a first-degree assault on Parks, and Biscoe admitted during questioning by St. Mary’s Circuit Judge Michael J. Stamm that she repeatedly stabbed Parks.

Outside the courthouse, Biscoe said that she was walking in the front area of the store when she was “blindsided,” and that the two younger girls accompanying her only tried to break up the ensuing dispute.