S.C. sheriff: Parents saw anger rising in teen accused in plot

CHESTERFIELD, S.C. — One evening last week, Ryan Schallenberger lost his temper.

It started with a disagreement with his mother, said Chesterfield County Sheriff Sam Parker. Then the 18-year-old, a high-ranking senior at Chesterfield High School, began banging his head against a wall. Deputies were called to the home, off a mile-long, unpaved road.

In the days that followed, Schallenberger's mother and stepfather sought psychological help for him, Parker said. The mother, Laurie Sittley, told the sheriff she had noticed recent changes in her son's personality.

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