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Police were called and found Ms. Norwood lying on the bathroom floor with her hands and feet bound by zip ties. Ms. Norwood told police that one assailant tried to steal money while the other attacked Ms. Murray, then her.

But Mr. McCarthy said investigators found a box of ties that Ms. Norwood apparently used to bind her feet and then her hands, pulling the ties tight with her teeth.

He said police also found two sets of footprints in blood inside the crime scene, determined to belong to Ms. Norwood, and a pair of size 14 shoes that are kept in the store to fit customers for athletic pants, according to court documents.

Mr. McCarthy said Ms. Norwood tracked the shoes through the blood, cleaned them and put them back on the shelf. They still had some blood on the bottom, “despite her best efforts,” he said.

Among the other inconsistencies in her story, Ms. Norwood told police that the assailants let her leave the Wisconsin Avenue store to move Ms. Murray’s car but ordered her to return in 10 minutes or they would kill her, according to the court records.

Mr. McCarthy said a county police officer saw a person sitting in the vehicle for about 1½ hours that night. That person, the prosecutor said, was Ms. Norwood, “trying to decide what to do.”

In addition, crime-scene photos suggested that Ms. Norwood had posed herself in the bathroom, her injuries were inconsistent with the brutal attack, and an examination of Ms. Murray’s body found she had not been raped, according to court documents.

She did not appear to react to Mr. McCarthy’s statements.

Her public defender, Alan Drew, said Ms. Norwood is entitled to a reasonable bail, noting that she has three sisters, a brother and a brother-in-law in the area.

“We’re not going to try the case here today,” he said. It was unclear whether Ms. Norwood had any family or friends in the courtroom.

Mr. Drew did not address the bevy of reporters and TV cameras gathered in front of the courthouse.

Ms. Norwood’s next court date is April 15. Mr. McCarthy said his office expects to present the case to a grand jury before that date. If indicted and convicted, Ms. Norwood faces up to life in prison on the charge of first-degree murder.