PUBLISHED: 21:40 EST, 16 December 2015 | UPDATED: 22:47 EST, 16 December 2015
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Chilling text messages that a man sent after he allegedly choked to death his 20-year-old roommate in Virginia have been revealed as his lawyers will use an insanity defense during his murder trial.
Steven Vander Briel is charged with killing Grace Rebecca Mann, a University of Mary Washington student majoring in history and American studies, on April 17.
The 30-year-old has pleaded not guilty to charges of first-degree murder, strangulation and abduction.
His attorney filed a notice of an insanity defense Tuesday after using a psychiatrist in Charlottesville, Virginia to do an evaluation on him, NBC Washington reported.
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Accused: Police have charged Steven Vander Briel (left), 30, with April 17 first-degree murder, strangulation and abduction of 20-year-old Grace Rebecca Mann (right)
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Horrific: Grace Mann (above) was found dead by two other female roommates with plastic bags stuffed down her throat and one cinched around her head inside the home they shared in Virginia
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Loving family: Grace Mann (left) was the daughter of Thomas Mann (center) , a juvenile and domestic relations court judge in Fairfax County, and Melissa Mann (right)
However, his attorney would not release the psychiatrist's diagnosis of his client.
Briel shared a house with Mann, the daughter of a juvenile and domestic relations court judge in Fairfax County, and two other women as a part-time student at the school located in Fredericksburg, Virginia.
The two other roommates, Holly Aleksonis and Katheryn Erwin, came home and discovered Mann with a plastic bag stuffed down her throat and a plastic shopping bag cinched over hear head as her body lay on the floor with a purple comforter over it, according to Fredericksburg.com.
Briel was still in the house when the grisly discovery was made, but he fled and was later tracked down by police who arrested him.
According to NBC Washington, the Aleksonis and Erwin said Briel was behaving strangely just before they discovered her body.
Erwin testified over the summer during a hearing that she started receiving text messages from Briel around 2.40pm that day asking when they would be home.
About 2.40pm, Erwin testified in court, she started getting text messages from Vander Briel asking when they would be home.
he testified in court that Briel sent a text message to her that said: 'I was in [victim's roommate]'s room and I made a mess.'
During her testimony, Erwin said that Briel seemed 'neurotic, manic' and was making confusing statements when she and Aleksonis arrived back at the home they shared.
According to her testimony, Erwin said that Briel asked them: 'What would you do if Grace wasn't here anymore and if he needed to move out.'
The roommates also testified that he confessed to them that he killed Mann after they had an argument, according to NBC Washington.
Briel, who attended UMW from 2002 to 2007, re-enrolled for the spring 2015 semester as a political science major.
Mann was a well-liked student who was an executive board member of Feminist United and recently appointed to the President's Task Force on Sexual Assault.
She was also a member of the Student Government Association Senate.
'She was moving mountains,' one student, Theresa Buczek, wrote on Facebook.
I don't see what her political leanings have to do with anything. The article doesn't even suggest that they are some type of motivation for the killing.
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