AP, Sidney :A man was sentenced to 100 years in prison Friday in a Montana teacher’s murder – a case that local officials say robbed the victim’s rural hometown of its innocence amid an oil boom that’s swept across the Northern Plains.Michael Keith Spell, 25, of Parachute, Colorado, was sentenced following a hearing before state District Judge Richard Simonton in Sidney.Spell, who is mentally disabled and described by the defense as functionally illiterate, pleaded guilty in October to killing Sherry Arnold, 43, after attempting to abduct the popular math teacher as she was jogging near her home in 2012.
