A 20-year-old University of Mary Washington student was found murdered on Friday in Virginia and her older male roommate has now been arrested and charged with the killing. Grace Rebecca Mann, 20, was found unconscious by two female roommates in the home they shared in Fredericksburg, near the college campus, about 3pm. Local reports say Mann was asphyxiated and found with a plastic bag stuffed into her throat, however police have not commented on the cause of death. The fourth roommate of the house, Steven Vander Briel, 30, was home when the two women stumbled upon the body, but ran out of the house, according to Fredericksburg.com. Scroll down for video . Murdered: A University of Mary Washington student has been charged with abduction and murder in the death of his roommate, 20-year-old Grace Rebecca Mann of Falls Church (pictured) Charged: Steven Vander Briel, 30 (left), is accused of killing Mann (right), an active UMW junior, and fleeing the scene. He was arrested two hours later in a church parking lot. Mann is believed to have been asphyxiated . One of the women started to perform CPR as the other called 911. Mann - the daughter of a juvenile and domestic relations court judge in Fairfax County - was rushed to Mary Washington Hospital, but pronounced dead shortly after arriving. A major manhunt was subsequently launched for Briel. A nearby school, James Monroe High School, was placed on lock-down as officers scoured the streets with police dogs. Just over two hours later, about 5.30pm, some officers saw Briel emerge from the woods near Riverside First Church of God on Fall Hill Avenue. He was arrested and taken in for questioning. Police have since charged Briel with first-degree murder and abduction. Scene: Grace Rebecca Mann, 20, was found unconscious by two female roommates in a home on Washington Avenue about 3 p.m., Fredericksburg Police said. Four people lived at the home - Mann and Briel, and two other females that found Mann's body . Manhunt: Vander Briel was taken into custody following a two-hour manhunt that included police dogs and about 20 city police officers . Accused: Police have charged Steven Vander Briel, 30, with first-degree murder and abduction in the death of Grace Rebecca Mann . Family: Grace Mann is the daughter of Thomas Mann, a juvenile and domestic relations court judge in Fairfax County, and Melissa Mann, local media reported . There was no known personal relationship between Mann and Briel, other than the fact they lived together,NBC Washington reported. No motive has been released and the circumstances surrounding the death also remain unknown. Briel attended UMW from 2002 to 2007 and then re-enrolled for the spring 2015 semester as a political science major. Mann was a junior from Falls Church, Virginia. She was a history and American studies major. She also 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. Active: Mann was a popular and active UMW junior who was majoring in history and American studies . Popular: Mann was an executive board member of Feminist United and recently appointed to the President’s Task Force on Sexual Assault. As word spread around campus Friday, tributes started pouring in for Mann, who was described as determined and energetic. UMW Senior Paige McKinsey told NBC Washington that Mann was working towards becoming a lawyer. 'As an American Studies major, Grace focused her studies on the mass incarceration rates of underprivileged communities with hopes of becoming a lawyer to one day serve those communities,' McKinsey said. 'As a friend, Grace brought love and joy into every interaction and every person she came across.'
Grace Rebecca Mann, 20, was found unconscious Friday afternoon by two female roommates at their home in Fredericksburg, Virginia . The fourth roommate, Steven Vander Briel, 30, was at home but fled . He was arrested a few later emerging from woods near church . Briel was charged with first-degree murder and abduction . Mann, a popular junior, reportedly had a plastic bag down her throat . Her father Thomas Mann is a juvenile and domestic relations court judge in Fairfax County .