U.S. Attorney William Ihlenfeld said a second teenager was in custody, but authorities haven't named her or said what she's being charged with.
Straface said he is not representing that suspect, and the Monongalia County prosecutor's office didn't immediately return messages.
Neese was last seen on surveillance video leaving her family's apartment voluntarily and getting into a car on July 6, 2012. She was initially considered a runaway, but her parents soon suspected she was abducted.
The recovery of her body led to changes in West Virginia's Amber Alert process.
Legislators recently passed "Skylar's Law" so Amber Alerts are not limited to kidnappings. It now requires law enforcement officials to relay initial reports of any missing child to State Police, who then contact the Amber Alert system.
Amber Alert personnel would then decide whether to issue an alert.
University High School, Principal Shari Burgess would not confirm that Shoaf was a student there but said that anytime a tragedy occurs, counselors are on hand to help students.
Though classes went on uninterrupted Wednesday, Burgess said there would be an announcement advising students that help was available for those who need it.
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