FBI profiler suggests Nancy Guthrie's abductor may be obsessed with the family, seeking emotional reactions rather than material gain.
FBI releases suspect description in Nancy Guthrie case, ups reward to $100K as agents review more than 13,000 tips.
Dr Ann Burgess, a pioneer of FBI behavioural profiling, says suspect in Nancy Guthrie disappearance likely acted with a personal motive, pointing to behavioural clues seen in surveillance footage.
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