MCLEOD COUNTY, Minn. -- D.J. Rotter's life was forever changed when, 13 years ago, her youngest daughter began dating Christian Oberender; a man who as a 14-year-old boy was found to have murdered his mother in his Watertown Township home.

"I told her she could see him but it was never going to be alone, I had to accompany them wherever they went," Rotter said Wednesday night.

Rotter said she knew if she forbade it the two would date anyway so she closely kept watch.

The relationship ended she said and then began again two years ago.

"I really did make an effort to take him and to show him what a good family was about," Rotter said of trying always to welcome Oberender to family functions.

But in the fall of 2012 her daughter told her Oberender took to shooting guns for hours back at the Watertown Township residence where his brother lived and where he shot his mother to death in 1995.

That's when Rotter friended Oberender on Facebook and said she was terrified.

"I said I think I should call somebody because I'm getting scared. And then I saw those pictures, when he really got proud of his guns," Rotter said of seeing the pictures Oberender posted on his Facebook wall of guns.

What she saw was the arsenal Oberender illegally amassed; 13 guns, including semi automatic rifles, an AK 47 and handguns.

To get them authorities says Oberender lied on gun permits saying no to questions about his past as being committed as mentally ill and dangerous.

In 1998 Oberender was committed as mentally ill and dangerous to St. Peter; at that time mental health records said "there is substantial likelihood that Oberender will engage in acts capable of inflicting serious physical harm to another."

Rotter also saw pictures posted on Oberender's facebook wall that tonight she won't look at again.

There were two photos, one showing the character the Tin Man from the "Wizard of Oz" slaying children, another showing bloody snowmen.

"I was afraid for my daughter's life. I did not know what he would do or when," Rotter said.

Rotter called the Carver County Sheriff's department on New Year's Eve of 2012; Oberender was arrested two days later.

It was after the arrest when she also learned about a note Oberender penned to his dead mother, titled Dear Mom.

In it he wrote:

"I think about killing all the time."
"The monster want out. I know what happens when he comes out. He only been out one time and someone die...The monster want to hurt people."

Tonight Rotter says she doesn't regret turning Oberender in even though it hurt her daughter and even though she says Oberender knows she did it

But lack of regret isn't lack of fear.

"I have this feeling that I've got five years before I have to worry every day about what is going to happen to me, what is going to happen to my children," Rotter said.

Five years is the prison penalty for the charges Oberender faces for the weapons possession.

Rotter has an order for protection but not at all a sense of safety.

"I don't know what is going to happen to my family and that's why I'm here, that's why I am doing this because I am really afraid."

Oberender's trial begins on Tuesday in Carver County.

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