Two men suspected in the abduction and apparent killing of Montana teacher Sherry Arnold have pleaded not guilty to charges of aggravated kidnapping.

Forty-seven-year old Lester Van Waters Jr. and 22-year-old Michael Keith Spell were arraigned Tuesday in state district court in Arnold's hometown of Sidney, near the North Dakota border.

The 43-year-old math teacher disappeared during a morning run on Jan. 7.

Spell has allegedly told investigators that he grabbed Arnold as she was jogging along a city street and that Waters choked her to death.

State District Judge Katherine Irigoin set separate five-day trials for the men to begin in July.

Despite Spell's alleged efforts to lead authorities to Arnold's grave site, her body has not been found.