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A Waring Street man pleaded guilty Tuesday before Erie County Judge Timothy J. Drury to trying to kill a 15-year-old North Buffalo boy during a robbery.

Sean Costner, 18, pleaded guilty to attempted murder, robbery and drug charges in three cases. His co-defendant, Amanda Sheridan, 15, pleaded guilty as a juvenile offender to second-degree robbery for arranging the Oct. 25 daylight torture-stabbing of Marquis Gross.

Costner also pleaded guilty to cocaine possession in his Oct. 30 arrest and to an unrelated attempted robbery charge for an Oct. 17 Waring Street incident.

Drury ordered Costner to remain jailed pending the Feb. 4 sentencings of both him and Ms. Sheridan of Fairfield Avenue, but he let Ms. Sheridan remain free on $10,000 previously posted bail.

The judge told Costner, who faces a prison term of as much as 25 years, that he is "leaning toward" the maximum sentence.

Court officials said Ms. Sheridan faces a maximum of seven years in custody.

Ms. Sheridan told the judge she and Costner planned the attack on Gross and that they went into the Gross house, "looking for money." The prosecutor said she was offered a plea deal because of her age and because Costner stabbed the boy.

Costner was arrested on Genesee Street about 11 p.m. Oct. 30 after he offered crack cocaine in exchange for sex to an undercover police officer working as a prostitute decoy. Two days later was charged with the violent Hinman street incident.

Bound and gagged with duct tape and repeatedly stabbed after Ms. Sheridan let Costner into the Hinman Avenue home, the boy managed to escape by jumping out a first-floor window shortly after 11 a.m. Oct. 25.

Wearing only in his underclothes and bleeding from 12 stab wounds, including a near-fatal wound to the heart, he was saved when neighbors summoned help.

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