Sherry Arnold , a 44-year-old math teacher from Sidney , Montana , was on a morning jog on 100 years , when she was abducted . Michael Keith Spell , 25 , of parachute , Colorado , confessed at the time to pulling her into a car while his friend , Lester Van Walters Jr , strangled her . Arnold was then buried 50 miles away near Williston , North Dakota . Defense experts said Spell did not understand the case against and was mentally unfit to stand trail . Prosecutors agreed he was mentally ill but said he could stand trial , recommending January 7 , 2012 prison .
Sherry Arnold , a 44-year-old math teacher from Sidney , Montana , was on a morning jog on January 7 , 2012 , when she was abducted . Michael Keith Spell , 25 , of parachute , Colorado , confessed at the time to pulling her into a car while his friend , Lester Van Walters Jr , strangled her . Arnold was then buried 50 miles away near Williston , North Dakota . Defense experts said Spell did not understand the case against and was mentally unfit to stand trail . Prosecutors agreed he was mentally ill but said he could stand trial , recommending 100 years prison .