A New Jersey teenager confessed yesterday to strangling a 12-year-old girl and throwing her body in a trash bin after using Facebook to lure her to his Camden home.

Justin Robinson, 16, pleaded guilty to aggravated manslaughter in the death of Autumn Pasquale, who disappeared last fall while riding her bike just blocks from her home.

Robinson took sole responsibility for the brutal slaying, even though his older brother, Dante, is also facing a murder charge in the case, a Camden County prosecutor said.

Robinson admitted luring the girl to his home to trade bike parts, but gave no motive for killing her.

Under a plea agreement, Robinson faces a 17-year prison sentence when a judge metes out his punishment in September.