New York University students holds vigil for Chapel Hill victims on Wednesday, Feb. 11, 2015 (Photo: Nadeen Hassan Shaker)

Namee Barakat and his wife Layla Barakat, parents of shooting victim Deah Shaddy Barakat, react as a video is played during a vigil on the campus of the University of North Carolina in Chapel Hill, North Carolina February 11, 2015 (Photo: Reuters)

Namee Barakat, right, wipes away tears as he and his wife, Layla, left, watch photos projected on a screen during a vigil for his son, daughter-in-law and her sister, who were killed at a condominium near UNC-Chapel Hill, Wednesday, Feb. 11, 2015, in Chapel Hill, N.C (Photo: AP)

People gather at UNC-Chapel Hill's "Pit" to mourn for Deah Shaddy Barakat, his wife Yusor Mohammed and her sister Razan Mohammed Abu-Salha in Chapel Hill, N.C., Wednesday, Feb. 11, 2015 (Photo: AP)

Students gather during a vigil on the campus of the University of North Carolina, for Deah Shaddy Barakat, his wife Yusor Mohammad and Yusor's sister Razan Mohammad Abu-Salha who were killed in Chapel Hill, North Carolina February 11, 2015 (Photo: Reuters)

UNC Dental School students make the North Carolina State University Wolfpack sign following a candlelight vigil for their slain classmate, who, along with two others, was killed at a condominium near UNC-Chapel Hill, Wednesday, Feb. 11, 2015, in Chapel Hill, N.C (Photo: AP)

People are silhouetted as they attend a candlelight vigil at the school on Wednesday, Feb. 11, 2015, in downtown Flint, Mich., in memory of three people who were killed Tuesday near UNC-Chapel Hill, N.C (Photo: AP)

University of Michigan-Flint students, from left to right, Bilal Ali, Michael Puro, Mohamed Samman and Zafir Abutalih attend a vigil at the school on Wednesday, Feb. 11, 2015, in downtown Flint, Mich., in memory of three people who were killed Tuesday near UNC-Chapel Hill, N.C (Photo: AP)

University of Michigan-Flint freshmen Noor Abdalla, Shurooq Zaki and Deema Almansour, center left to right, attend a candlelight vigil at the school on Wednesday, Feb. 11, 2015, in downtown Flint, Mich., in memory of three people who were killed Tuesday near UNC-Chapel Hill, N.C (Photo: AP)

A woman cries during a vigil as she watches photos projected on a screen of three people who were killed at a condominium near UNC-Chapel Hill, Wednesday, Feb. 11, 2015, in Chapel Hill, N.C (Photo: AP)