The man accused of killing nursing student Holly Bobo has a long criminal history that includes violence against his own mother.
Zachary Adams, 29, is charged with first degree murder and aggravated kidnapping in the death of Bobo, who was last seen outside her Decatur County home nearly three years ago.
Court documents reveal Adams was no stranger to investigators in his small town and had a troubled past, leaving many to question why he was even out of jail in the first place.
In addition to numerous drug charges, Adams also has a history of assault and domestic violence.
In 2004, when he was just 19, Adams was accused of shooting his mother in the knee at point blank range.
His stepfather took out a petition for an order of protection and said family members feared for their lives and he believed Adams was a danger to the community.
In 2005, court documents show Adams threatened to shoot his grandparents with a shotgun.
Then, in July 2011, just three months after Bobo disappeared, another woman told police Adams assaulted her at the same home the Tennessee Bureau of Investigation recently searched in connection with the Bobo case.
The woman said, "He gripped my neck and pushed me to the floor." The woman also said when she tried to get away Adams allegedly threatened to shoot her so she came back.
"That's when he pushed me against the truck and got me on the ground and started hitting me again. When he stopped I sat on the front steps, when I didn't look at him he would squeeze my head till I would look him in the eyes. Then, he punched me across the porch." The woman went on to say, "He said he would shoot me just like he did his mom."
In February of this year, another woman said Adams held a black revolver to her head and threatened to kill her. He also pulled a knife on her while threatening to gut her, according to court documents.
Investigators have not said what a motive for Bobo's murder might have been or what evidence they have against Adams.
Sources told News 2 Bobo and Adams were not friends and she did not hang out with his circle of friends.
There has been no indication Bobo's body has been found.
Bobo's family has yet to comment on Adams' indictment. Their pastor said they were "shocked."
Representatives with the TBI and FBI met with the family prior to Wednesday's news conference.
The TBI has not ruled out the possibility of other arrests.
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