A man was charged Wednesday with kidnapping and murdering a nursing student who was last seen outside her West Tennessee home nearly three years ago, investigators announced. Holly Bobo, 20, disappeared on April 13, 2011, with her brother telling police he saw a man in hunting clothes leading her into the woods.

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Zachary Adams, 29, was arrested last week on an unrelated aggravated assault charge and authorities have now announced a grand jury indictment against Adams in the Bobo case.

It's unclear what evidence ties Adams to Bobo's disappearance, but police said they're confident they can win a conviction against Adams.

Bobo's brother, Clint, has reportedly said that he mistakenly thought his sister was outside with her boyfriend and they were in an argument.

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Watch Jonathan Serrie's report above, and read more from the Associated Press below.

Adams' home in the Holladay community is about 15 miles from Bobo's home where she was last seen.

Adams was in custody with no bond set. [Tennessee Bureau of Investigation director Mark Gwyn] did not rule out the possibility of other arrests in the case and said the investigation in continuing.

Gwyn said someone from the TBI spoke with the Bobo family before the indictment was announced at a news conference.

"Obviously, they're devastated," Gwyn said.

Asked about the basis for the charges of especially aggravated kidnapping and first degree felony murder, District Attorney General Hansel McCadams said, "We believe we can prove that she was taken forcefully from her home without her consent."

"Based on the evidence that we have before us, we also feel that she was killed in the perpetration of that kidnapping," McAdams said.

McCadams said he will consider pursuing the death penalty if Adams is convicted.

Adams was indicted during a specially called session of the grand jury and his arraignment is set for Tuesday. He will tell a judge at that time whether he can afford to hire a lawyer or if he needs one appointed.

After Bobo's disappearance, investigators and volunteers scoured the town of about 2,400 people and the surrounding terrain where cow pastures, old barns, thick woods, flowery fields and dusty back roads comprise the landscape. Residents adorned mailboxes, lamp posts and store fronts with pink bows, as a sign of hope and solidarity with the family. Pink became the color associated with Bobo because she was wearing a pink shirt and carrying a pink purse when she disappeared.