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			 Michael Spell, 25, of Parachute, Colorado, pleaded guilty in 
			October to deliberate homicide in the strangling death of math 
			instructor Sherry Arnold, legal documents showed. Under a deal with 
			prosecutors, an attempted kidnapping charge was dropped. 
			 
			The agreement came after several court hearings that sought to 
			determine Spell's competence, with defense attorneys claiming he was 
			unfit to stand trial because of mental deficiencies. 
			 
			Arnold, 43, vanished in January 2012 while on a predawn run in her 
			rural hometown of Sidney, where at the time authorities were noting 
			a sharp increase in population and crime tied to an oil boom 
			spanning northeastern Montana and northwestern North Dakota. 
			
			  Spell later told police he and Lester Waters, a friend from 
			Parachute, had smoked crack cocaine while driving through Sidney to 
			oilfield jobs in Williston, North Dakota, when Arnold jogged by and 
			Waters ordered him to pull her into their car. 
			 
			Spell told investigators Waters "choked her out" in the back seat, 
			but prosecutors accused Spell of strangling the teacher. 
			 
			Arnold "lay dead inside the vehicle and under a blanket" while the 
			men drove to Williston, where they disposed of her clothing in a 
			dumpster and bought a shovel to bury the body in a shallow grave 
			outside town, a Montana prosecutor said in a sworn statement. 
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			Spell apologized for his actions during Friday's sentencing hearing 
			before Judge Richard Simonton in Sidney, a court official said. His 
			defense attorney did not immediately respond to a request for 
			comment. 
			 
			Waters was sentenced by a Montana judge in December to 80 years in 
			prison for his role in Arnold's death, state Department of 
			Corrections records show. 
			 
			(Reporting by Laura Zuckerman in Salmon, Idaho; Editing by Daniel 
			Wallis and Eric Beech) 
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